diff --git a/src/views/Charts/components/InstanceActivity.vue b/src/views/Charts/components/InstanceActivity.vue
index 5e136bb8..16668db3 100644
--- a/src/views/Charts/components/InstanceActivity.vue
+++ b/src/views/Charts/components/InstanceActivity.vue
@@ -111,11 +111,14 @@
             </div>
         </div>
         <div class="status-online">
-            <el-statistic
-                :title="t('view.charts.instance_activity.online_time')"
-                :formatter="(val) => timeToText(val, true)"
-                :value="totalOnlineTime">
-            </el-statistic>
+            <div class="text-center">
+                <div class="text-sm text-muted-foreground">
+                    {{ t('view.charts.instance_activity.online_time') }}
+                </div>
+                <div class="text-2xl font-semibold">
+                    {{ timeToText(totalOnlineTime, true) }}
+                </div>
+            </div>
         </div>
 
         <div ref="activityChartRef" style="width: 100%"></div>
@@ -713,9 +716,6 @@
     .status-online {
         display: flex;
         justify-content: center;
-        :deep(.el-statistic__head) {
-            display: flex;
-            justify-content: center;
-        }
+        text-align: center;
     }
 </style>
diff --git a/src/views/Favorites/FavoritesAvatar.vue b/src/views/Favorites/FavoritesAvatar.vue
index 5e00e199..b6dcf6aa 100644
--- a/src/views/Favorites/FavoritesAvatar.vue
+++ b/src/views/Favorites/FavoritesAvatar.vue
@@ -72,8 +72,19 @@
                 </DropdownMenu>
             </div>
         </div>
-        <el-splitter class="favorites-splitter" @resize-end="handleAvatarSplitterResize">
-            <el-splitter-panel :size="avatarSplitterSize" :min="0" :max="360" collapsible>
+        <ResizablePanelGroup
+            ref="avatarSplitterGroupRef"
+            direction="horizontal"
+            class="favorites-splitter"
+            @layout="handleAvatarSplitterLayout">
+            <ResizablePanel
+                ref="avatarSplitterPanelRef"
+                :default-size="avatarSplitterDefaultSize"
+                :min-size="avatarSplitterMinSize"
+                :max-size="avatarSplitterMaxSize"
+                :collapsed-size="0"
+                collapsible
+                :order="1">
                 <div class="favorites-groups-panel">
                     <div class="group-section">
                         <div class="group-section__header">
@@ -329,8 +340,9 @@
                         </div>
                     </div>
                 </div>
-            </el-splitter-panel>
-            <el-splitter-panel>
+            </ResizablePanel>
+            <ResizableHandle with-handle @dragging="setAvatarSplitterDragging" />
+            <ResizablePanel :order="2">
                 <div class="favorites-content">
                     <div class="favorites-content__header">
                         <div class="favorites-content__title">
@@ -502,8 +514,8 @@
                         </template>
                     </div>
                 </div>
-            </el-splitter-panel>
-        </el-splitter>
+            </ResizablePanel>
+        </ResizablePanelGroup>
         <AvatarExportDialog v-model:avatarExportDialogVisible="avatarExportDialogVisible" />
     </div>
 </template>
@@ -513,8 +525,8 @@
     import { ElMessageBox, ElNotification, ElProgress } from 'element-plus';
     import { MoreFilled, Plus, Refresh } from '@element-plus/icons-vue';
     import { Ellipsis, RefreshCcw } from 'lucide-vue-next';
-    import { Button } from '@/components/ui/button';
     import { InputGroupField, InputGroupSearch } from '@/components/ui/input-group';
+    import { Button } from '@/components/ui/button';
     import { Loader } from 'lucide-vue-next';
     import { Spinner } from '@/components/ui/spinner';
     import { storeToRefs } from 'pinia';
@@ -538,6 +550,7 @@
     } from '../../components/ui/dropdown-menu';
     import { useAppearanceSettingsStore, useAvatarStore, useFavoriteStore, useUserStore } from '../../stores';
     import { Popover, PopoverContent, PopoverTrigger } from '../../components/ui/popover';
+    import { ResizableHandle, ResizablePanel, ResizablePanelGroup } from '../../components/ui/resizable';
     import { avatarRequest, favoriteRequest } from '../../api';
     import { Badge } from '../../components/ui/badge';
     import { Slider } from '../../components/ui/slider';
@@ -563,6 +576,12 @@
     const avatarGroupVisibilityOptions = ref(['public', 'friends', 'private']);
     const historyGroupKey = 'local-history';
     const avatarSplitterSize = ref(260);
+    const avatarSplitterFallbackWidth = typeof window !== 'undefined' && window.innerWidth ? window.innerWidth : 1200;
+    const avatarSplitterGroupRef = ref(null);
+    const avatarSplitterPanelRef = ref(null);
+    const avatarSplitterWidth = ref(avatarSplitterFallbackWidth);
+    const avatarSplitterDraggingCount = ref(0);
+    let avatarSplitterObserver = null;
 
     const { sortFavorites } = storeToRefs(useAppearanceSettingsStore());
     const { setSortFavorites } = useAppearanceSettingsStore();
@@ -698,22 +717,108 @@
 
     async function loadAvatarSplitterPreferences() {
         const storedSize = await configRepository.getString('VRCX_FavoritesAvatarSplitter', '260');
-        if (typeof storedSize === 'string' && !Number.isNaN(Number(storedSize)) && Number(storedSize) > 0) {
-            avatarSplitterSize.value = Number(storedSize);
+        const parsedSize = Number(storedSize);
+        if (Number.isFinite(parsedSize) && parsedSize >= 0) {
+            avatarSplitterSize.value = parsedSize;
         }
     }
 
-    function handleAvatarSplitterResize(panelIndex, sizes) {
+    const getAvatarSplitterWidthRaw = () => {
+        const element = avatarSplitterGroupRef.value?.$el ?? avatarSplitterGroupRef.value;
+        const width = element?.getBoundingClientRect?.().width;
+        return Number.isFinite(width) ? width : null;
+    };
+
+    const getAvatarSplitterWidth = () => {
+        const width = getAvatarSplitterWidthRaw();
+        return Number.isFinite(width) && width > 0 ? width : avatarSplitterFallbackWidth;
+    };
+
+    const resolveDraggingPayload = (payload) => {
+        if (typeof payload === 'boolean') {
+            return payload;
+        }
+        if (payload && typeof payload === 'object') {
+            if (typeof payload.detail === 'boolean') {
+                return payload.detail;
+            }
+            if (typeof payload.dragging === 'boolean') {
+                return payload.dragging;
+            }
+        }
+        return Boolean(payload);
+    };
+
+    const setAvatarSplitterDragging = (payload) => {
+        const isDragging = resolveDraggingPayload(payload);
+        const next = avatarSplitterDraggingCount.value + (isDragging ? 1 : -1);
+        avatarSplitterDraggingCount.value = Math.max(0, next);
+    };
+
+    const pxToPercent = (px, groupWidth, min = 0) => {
+        const width = groupWidth ?? getAvatarSplitterWidth();
+        return Math.min(100, Math.max(min, (px / width) * 100));
+    };
+
+    const percentToPx = (percent, groupWidth) => (percent / 100) * groupWidth;
+
+    const avatarSplitterDefaultSize = computed(() =>
+        pxToPercent(avatarSplitterSize.value, avatarSplitterWidth.value, 0)
+    );
+    const avatarSplitterMinSize = computed(() => pxToPercent(0, avatarSplitterWidth.value, 0));
+    const avatarSplitterMaxSize = computed(() => pxToPercent(360, avatarSplitterWidth.value, 0));
+
+    const handleAvatarSplitterLayout = (sizes) => {
         if (!Array.isArray(sizes) || !sizes.length) {
             return;
         }
-        const nextSize = sizes[0];
-        if (nextSize <= 0) {
+
+        if (avatarSplitterDraggingCount.value === 0) {
             return;
         }
-        avatarSplitterSize.value = nextSize;
-        configRepository.setString('VRCX_FavoritesAvatarSplitter', nextSize.toString());
-    }
+
+        const rawWidth = getAvatarSplitterWidthRaw();
+        if (!Number.isFinite(rawWidth) || rawWidth <= 0) {
+            return;
+        }
+
+        const nextSize = sizes[0];
+        if (!Number.isFinite(nextSize)) {
+            return;
+        }
+
+        const nextPx = Math.round(percentToPx(nextSize, rawWidth));
+        const clampedPx = Math.min(360, Math.max(0, nextPx));
+        avatarSplitterSize.value = clampedPx;
+        configRepository.setString('VRCX_FavoritesAvatarSplitter', clampedPx.toString());
+    };
+
+    const updateAvatarSplitterWidth = () => {
+        const width = getAvatarSplitterWidth();
+        avatarSplitterWidth.value = width;
+        const targetSize = pxToPercent(avatarSplitterSize.value, width, 0);
+        avatarSplitterPanelRef.value?.resize?.(targetSize);
+    };
+
+    onMounted(async () => {
+        await nextTick();
+        updateAvatarSplitterWidth();
+        const element = avatarSplitterGroupRef.value?.$el ?? avatarSplitterGroupRef.value;
+        if (element && typeof ResizeObserver !== 'undefined') {
+            avatarSplitterObserver = new ResizeObserver(updateAvatarSplitterWidth);
+            avatarSplitterObserver.observe(element);
+        }
+    });
+
+    watch(avatarSplitterSize, (value, previous) => {
+        if (value === previous) {
+            return;
+        }
+        if (avatarSplitterDraggingCount.value > 0) {
+            return;
+        }
+        updateAvatarSplitterWidth();
+    });
 
     const groupedAvatarFavorites = computed(() => {
         const grouped = {};
@@ -1536,6 +1641,10 @@
         if (typeof window !== 'undefined') {
             window.removeEventListener('resize', maybeFillLocalAvatarViewport);
         }
+        if (avatarSplitterObserver) {
+            avatarSplitterObserver.disconnect();
+            avatarSplitterObserver = null;
+        }
     });
 
     function formatVisibility(value) {
diff --git a/src/views/Favorites/FavoritesFriend.vue b/src/views/Favorites/FavoritesFriend.vue
index f79a97a1..d254a750 100644
--- a/src/views/Favorites/FavoritesFriend.vue
+++ b/src/views/Favorites/FavoritesFriend.vue
@@ -72,8 +72,19 @@
                 </DropdownMenu>
             </div>
         </div>
-        <el-splitter class="favorites-splitter" @resize-end="handleFriendSplitterResize">
-            <el-splitter-panel :size="friendSplitterSize" :min="0" :max="360" collapsible>
+        <ResizablePanelGroup
+            ref="friendSplitterGroupRef"
+            direction="horizontal"
+            class="favorites-splitter"
+            @layout="handleFriendSplitterLayout">
+            <ResizablePanel
+                ref="friendSplitterPanelRef"
+                :default-size="friendSplitterDefaultSize"
+                :min-size="friendSplitterMinSize"
+                :max-size="friendSplitterMaxSize"
+                :collapsed-size="0"
+                collapsible
+                :order="1">
                 <div class="favorites-groups-panel">
                     <div class="group-section">
                         <div class="group-section__header">
@@ -174,8 +185,9 @@
                         </div>
                     </div>
                 </div>
-            </el-splitter-panel>
-            <el-splitter-panel>
+            </ResizablePanel>
+            <ResizableHandle with-handle @dragging="setFriendSplitterDragging" />
+            <ResizablePanel :order="2">
                 <div class="favorites-content">
                     <div class="favorites-content__header">
                         <div class="favorites-content__title">
@@ -286,19 +298,19 @@
                         </template>
                     </div>
                 </div>
-            </el-splitter-panel>
-        </el-splitter>
+            </ResizablePanel>
+        </ResizablePanelGroup>
         <FriendExportDialog v-model:friendExportDialogVisible="friendExportDialogVisible" />
     </div>
 </template>
 
 <script setup>
-    import { computed, onBeforeMount, ref, watch } from 'vue';
+    import { computed, nextTick, onBeforeMount, onMounted, onUnmounted, ref, watch } from 'vue';
     import { MoreFilled, Refresh } from '@element-plus/icons-vue';
     import { Button } from '@/components/ui/button';
-    import { InputGroupSearch } from '@/components/ui/input-group';
     import { ElMessageBox } from 'element-plus';
     import { Ellipsis } from 'lucide-vue-next';
+    import { InputGroupSearch } from '@/components/ui/input-group';
     import { Spinner } from '@/components/ui/spinner';
     import { storeToRefs } from 'pinia';
     import { toast } from 'vue-sonner';
@@ -320,6 +332,7 @@
         DropdownMenuTrigger
     } from '../../components/ui/dropdown-menu';
     import { Popover, PopoverContent, PopoverTrigger } from '../../components/ui/popover';
+    import { ResizableHandle, ResizablePanel, ResizablePanelGroup } from '../../components/ui/resizable';
     import { useAppearanceSettingsStore, useFavoriteStore, useUserStore } from '../../stores';
     import { Badge } from '../../components/ui/badge';
     import { Slider } from '../../components/ui/slider';
@@ -335,6 +348,12 @@
     const friendGroupVisibilityOptions = ref(['public', 'friends', 'private']);
 
     const friendSplitterSize = ref(260);
+    const friendSplitterFallbackWidth = typeof window !== 'undefined' && window.innerWidth ? window.innerWidth : 1200;
+    const friendSplitterGroupRef = ref(null);
+    const friendSplitterPanelRef = ref(null);
+    const friendSplitterWidth = ref(friendSplitterFallbackWidth);
+    const friendSplitterDraggingCount = ref(0);
+    let friendSplitterObserver = null;
 
     const { sortFavorites } = storeToRefs(useAppearanceSettingsStore());
     const { setSortFavorites } = useAppearanceSettingsStore();
@@ -437,22 +456,115 @@
 
     async function loadFriendSplitterPreferences() {
         const storedSize = await configRepository.getString('VRCX_FavoritesFriendSplitter', '260');
-        if (typeof storedSize === 'string' && !Number.isNaN(Number(storedSize)) && Number(storedSize) > 0) {
-            friendSplitterSize.value = Number(storedSize);
+        const parsedSize = Number(storedSize);
+        if (Number.isFinite(parsedSize) && parsedSize >= 0) {
+            friendSplitterSize.value = parsedSize;
         }
     }
 
-    function handleFriendSplitterResize(panelIndex, sizes) {
+    const getFriendSplitterWidthRaw = () => {
+        const element = friendSplitterGroupRef.value?.$el ?? friendSplitterGroupRef.value;
+        const width = element?.getBoundingClientRect?.().width;
+        return Number.isFinite(width) ? width : null;
+    };
+
+    const getFriendSplitterWidth = () => {
+        const width = getFriendSplitterWidthRaw();
+        return Number.isFinite(width) && width > 0 ? width : friendSplitterFallbackWidth;
+    };
+
+    const resolveDraggingPayload = (payload) => {
+        if (typeof payload === 'boolean') {
+            return payload;
+        }
+        if (payload && typeof payload === 'object') {
+            if (typeof payload.detail === 'boolean') {
+                return payload.detail;
+            }
+            if (typeof payload.dragging === 'boolean') {
+                return payload.dragging;
+            }
+        }
+        return Boolean(payload);
+    };
+
+    const setFriendSplitterDragging = (payload) => {
+        const isDragging = resolveDraggingPayload(payload);
+        const next = friendSplitterDraggingCount.value + (isDragging ? 1 : -1);
+        friendSplitterDraggingCount.value = Math.max(0, next);
+    };
+
+    const pxToPercent = (px, groupWidth, min = 0) => {
+        const width = groupWidth ?? getFriendSplitterWidth();
+        return Math.min(100, Math.max(min, (px / width) * 100));
+    };
+
+    const percentToPx = (percent, groupWidth) => (percent / 100) * groupWidth;
+
+    const friendSplitterDefaultSize = computed(() =>
+        pxToPercent(friendSplitterSize.value, friendSplitterWidth.value, 0)
+    );
+    const friendSplitterMinSize = computed(() => pxToPercent(0, friendSplitterWidth.value, 0));
+    const friendSplitterMaxSize = computed(() => pxToPercent(360, friendSplitterWidth.value, 0));
+
+    const handleFriendSplitterLayout = (sizes) => {
         if (!Array.isArray(sizes) || !sizes.length) {
             return;
         }
-        const nextSize = sizes[0];
-        if (nextSize <= 0) {
+
+        if (friendSplitterDraggingCount.value === 0) {
             return;
         }
-        friendSplitterSize.value = nextSize;
-        configRepository.setString('VRCX_FavoritesFriendSplitter', nextSize.toString());
-    }
+
+        const rawWidth = getFriendSplitterWidthRaw();
+        if (!Number.isFinite(rawWidth) || rawWidth <= 0) {
+            return;
+        }
+
+        const nextSize = sizes[0];
+        if (!Number.isFinite(nextSize)) {
+            return;
+        }
+
+        const nextPx = Math.round(percentToPx(nextSize, rawWidth));
+        const clampedPx = Math.min(360, Math.max(0, nextPx));
+        friendSplitterSize.value = clampedPx;
+        configRepository.setString('VRCX_FavoritesFriendSplitter', clampedPx.toString());
+    };
+
+    const updateFriendSplitterWidth = () => {
+        const width = getFriendSplitterWidth();
+        friendSplitterWidth.value = width;
+        const targetSize = pxToPercent(friendSplitterSize.value, width, 0);
+        friendSplitterPanelRef.value?.resize?.(targetSize);
+    };
+
+    onMounted(async () => {
+        await nextTick();
+        updateFriendSplitterWidth();
+        const element = friendSplitterGroupRef.value?.$el ?? friendSplitterGroupRef.value;
+        if (element && typeof ResizeObserver !== 'undefined') {
+            friendSplitterObserver = new ResizeObserver(updateFriendSplitterWidth);
+            friendSplitterObserver.observe(element);
+        }
+    });
+
+    onUnmounted(() => {
+        if (friendSplitterObserver) {
+            friendSplitterObserver.disconnect();
+            friendSplitterObserver = null;
+        }
+    });
+
+    watch(friendSplitterSize, (value, previous) => {
+        if (value === previous) {
+            return;
+        }
+        if (friendSplitterDraggingCount.value > 0) {
+            return;
+        }
+        updateFriendSplitterWidth();
+    });
 
     const remoteGroupMenuKey = (key) => `remote:${key}`;
 
diff --git a/src/views/Favorites/FavoritesWorld.vue b/src/views/Favorites/FavoritesWorld.vue
index 0e5c3262..f9d7f6ac 100644
--- a/src/views/Favorites/FavoritesWorld.vue
+++ b/src/views/Favorites/FavoritesWorld.vue
@@ -72,8 +72,19 @@
                 </DropdownMenu>
             </div>
         </div>
-        <el-splitter class="favorites-splitter" @resize-end="handleWorldSplitterResize">
-            <el-splitter-panel :size="worldSplitterSize" :min="0" :max="360" collapsible>
+        <ResizablePanelGroup
+            ref="worldSplitterGroupRef"
+            direction="horizontal"
+            class="favorites-splitter"
+            @layout="handleWorldSplitterLayout">
+            <ResizablePanel
+                ref="worldSplitterPanelRef"
+                :default-size="worldSplitterDefaultSize"
+                :min-size="worldSplitterMinSize"
+                :max-size="worldSplitterMaxSize"
+                :collapsed-size="0"
+                collapsible
+                :order="1">
                 <div class="favorites-groups-panel">
                     <div class="group-section">
                         <div class="group-section__header">
@@ -278,8 +289,9 @@
                         </div>
                     </div>
                 </div>
-            </el-splitter-panel>
-            <el-splitter-panel>
+            </ResizablePanel>
+            <ResizableHandle with-handle @dragging="setWorldSplitterDragging" />
+            <ResizablePanel :order="2">
                 <div class="favorites-content">
                     <div class="favorites-content__header">
                         <div class="favorites-content__title">
@@ -416,8 +428,8 @@
                         </template>
                     </div>
                 </div>
-            </el-splitter-panel>
-        </el-splitter>
+            </ResizablePanel>
+        </ResizablePanelGroup>
         <WorldExportDialog v-model:worldExportDialogVisible="worldExportDialogVisible" />
     </div>
 </template>
@@ -450,6 +462,7 @@
         DropdownMenuTrigger
     } from '../../components/ui/dropdown-menu';
     import { Popover, PopoverContent, PopoverTrigger } from '../../components/ui/popover';
+    import { ResizableHandle, ResizablePanel, ResizablePanelGroup } from '../../components/ui/resizable';
     import { useAppearanceSettingsStore, useFavoriteStore, useWorldStore } from '../../stores';
     import { favoriteRequest, worldRequest } from '../../api';
     import { Badge } from '../../components/ui/badge';
@@ -548,6 +561,12 @@
 
     const worldGroupVisibilityOptions = ref(['public', 'friends', 'private']);
     const worldSplitterSize = ref(260);
+    const worldSplitterFallbackWidth = typeof window !== 'undefined' && window.innerWidth ? window.innerWidth : 1200;
+    const worldSplitterGroupRef = ref(null);
+    const worldSplitterPanelRef = ref(null);
+    const worldSplitterWidth = ref(worldSplitterFallbackWidth);
+    const worldSplitterDraggingCount = ref(0);
+    let worldSplitterObserver = null;
     const worldExportDialogVisible = ref(false);
     const worldFavoriteSearch = ref('');
     const worldFavoriteSearchResults = ref([]);
@@ -595,22 +614,106 @@
 
     async function loadWorldSplitterPreferences() {
         const storedSize = await configRepository.getString('VRCX_FavoritesWorldSplitter', '260');
-        if (typeof storedSize === 'string' && !Number.isNaN(Number(storedSize)) && Number(storedSize) > 0) {
-            worldSplitterSize.value = Number(storedSize);
+        const parsedSize = Number(storedSize);
+        if (Number.isFinite(parsedSize) && parsedSize >= 0) {
+            worldSplitterSize.value = parsedSize;
         }
     }
 
-    function handleWorldSplitterResize(panelIndex, sizes) {
+    const getWorldSplitterWidthRaw = () => {
+        const element = worldSplitterGroupRef.value?.$el ?? worldSplitterGroupRef.value;
+        const width = element?.getBoundingClientRect?.().width;
+        return Number.isFinite(width) ? width : null;
+    };
+
+    const getWorldSplitterWidth = () => {
+        const width = getWorldSplitterWidthRaw();
+        return Number.isFinite(width) && width > 0 ? width : worldSplitterFallbackWidth;
+    };
+
+    const resolveDraggingPayload = (payload) => {
+        if (typeof payload === 'boolean') {
+            return payload;
+        }
+        if (payload && typeof payload === 'object') {
+            if (typeof payload.detail === 'boolean') {
+                return payload.detail;
+            }
+            if (typeof payload.dragging === 'boolean') {
+                return payload.dragging;
+            }
+        }
+        return Boolean(payload);
+    };
+
+    const setWorldSplitterDragging = (payload) => {
+        const isDragging = resolveDraggingPayload(payload);
+        const next = worldSplitterDraggingCount.value + (isDragging ? 1 : -1);
+        worldSplitterDraggingCount.value = Math.max(0, next);
+    };
+
+    const pxToPercent = (px, groupWidth, min = 0) => {
+        const width = groupWidth ?? getWorldSplitterWidth();
+        return Math.min(100, Math.max(min, (px / width) * 100));
+    };
+
+    const percentToPx = (percent, groupWidth) => (percent / 100) * groupWidth;
+
+    const worldSplitterDefaultSize = computed(() => pxToPercent(worldSplitterSize.value, worldSplitterWidth.value, 0));
+    const worldSplitterMinSize = computed(() => pxToPercent(0, worldSplitterWidth.value, 0));
+    const worldSplitterMaxSize = computed(() => pxToPercent(360, worldSplitterWidth.value, 0));
+
+    const handleWorldSplitterLayout = (sizes) => {
         if (!Array.isArray(sizes) || !sizes.length) {
             return;
         }
-        const nextSize = sizes[0];
-        if (nextSize <= 0) {
+
+        if (worldSplitterDraggingCount.value === 0) {
             return;
         }
-        worldSplitterSize.value = nextSize;
-        configRepository.setString('VRCX_FavoritesWorldSplitter', nextSize.toString());
-    }
+
+        const rawWidth = getWorldSplitterWidthRaw();
+        if (!Number.isFinite(rawWidth) || rawWidth <= 0) {
+            return;
+        }
+
+        const nextSize = sizes[0];
+        if (!Number.isFinite(nextSize)) {
+            return;
+        }
+
+        const nextPx = Math.round(percentToPx(nextSize, rawWidth));
+        const clampedPx = Math.min(360, Math.max(0, nextPx));
+        worldSplitterSize.value = clampedPx;
+        configRepository.setString('VRCX_FavoritesWorldSplitter', clampedPx.toString());
+    };
+
+    const updateWorldSplitterWidth = () => {
+        const width = getWorldSplitterWidth();
+        worldSplitterWidth.value = width;
+        const targetSize = pxToPercent(worldSplitterSize.value, width, 0);
+        worldSplitterPanelRef.value?.resize?.(targetSize);
+    };
+
+    onMounted(async () => {
+        await nextTick();
+        updateWorldSplitterWidth();
+        const element = worldSplitterGroupRef.value?.$el ?? worldSplitterGroupRef.value;
+        if (element && typeof ResizeObserver !== 'undefined') {
+            worldSplitterObserver = new ResizeObserver(updateWorldSplitterWidth);
+            worldSplitterObserver.observe(element);
+        }
+    });
+
+    watch(worldSplitterSize, (value, previous) => {
+        if (value === previous) {
+            return;
+        }
+        if (worldSplitterDraggingCount.value > 0) {
+            return;
+        }
+        updateWorldSplitterWidth();
+    });
 
     const groupedWorldFavorites = computed(() => {
         const grouped = {};
@@ -1249,6 +1352,10 @@
         if (typeof window !== 'undefined') {
             window.removeEventListener('resize', maybeFillLocalFavoritesViewport);
         }
+        if (worldSplitterObserver) {
+            worldSplitterObserver.disconnect();
+            worldSplitterObserver = null;
+        }
     });
 </script>