diff --git a/packages/editor/src/layouts/page-bar/PageBarScrollContainer.vue b/packages/editor/src/layouts/page-bar/PageBarScrollContainer.vue
index 37d1d139..8a140869 100644
--- a/packages/editor/src/layouts/page-bar/PageBarScrollContainer.vue
+++ b/packages/editor/src/layouts/page-bar/PageBarScrollContainer.vue
@@ -78,6 +78,7 @@ const resizeObserver = new ResizeObserver(() => {
 
 onMounted(() => {
   pageBarEl.value && resizeObserver.observe(pageBarEl.value);
+  itemsContainerEl.value && resizeObserver.observe(itemsContainerEl.value);
 });
 
 onBeforeUnmount(() => {