Fix mode switcher display issue

islands/TopBar.tsx

@@ -146,7 +146,7 @@ export default function TopBar(props: TopBarProps) {
     <div className="pd-top-bar">
       <div
         className={`pd-top-bar-mode-switcher${
-          mode !== EditorMode.Both ? " hidden" : ""
+          props.allowMode !== EditorMode.Both ? " hidden" : ""
         }`}
       >
         <button