diff --git a/frontend/src/components/tree-editor/NodeEditorPanel.tsx b/frontend/src/components/tree-editor/NodeEditorPanel.tsx
index d56d0e6b..02054e96 100644
--- a/frontend/src/components/tree-editor/NodeEditorPanel.tsx
+++ b/frontend/src/components/tree-editor/NodeEditorPanel.tsx
@@ -162,7 +162,7 @@ export function NodeEditorPanel({ nodeId, onClose, onSelectType }: NodeEditorPan
   const isRoot = treeStructure?.id === nodeId
 
   return (
-    <div ref={panelRef} className="flex h-full min-h-0 w-[400px] shrink-0 flex-col border-l border-border bg-card">
+    <div ref={panelRef} className="flex h-full min-h-0 w-[400px] shrink-0 flex-col border-l border-border bg-card overflow-hidden">
       {/* Header */}
       <div className="flex items-center gap-2 border-b border-border px-4 py-3 shrink-0">
         <span className={cn('flex h-5 w-5 shrink-0 items-center justify-center rounded', config.badgeClass)}>
diff --git a/frontend/src/pages/TreeEditorPage.tsx b/frontend/src/pages/TreeEditorPage.tsx
index 731d29c9..b0af4285 100644
--- a/frontend/src/pages/TreeEditorPage.tsx
+++ b/frontend/src/pages/TreeEditorPage.tsx
@@ -407,7 +407,7 @@ export function TreeEditorPage() {
   }
 
   return (
-    <div className="flex h-full flex-col">
+    <div className="flex h-full flex-col overflow-hidden">
 
       {/* Draft Restore Prompt */}
       {showDraftPrompt && (