diff --git a/editor/app.js b/editor/app.js
index e0ce72729b..5bab20712a 100644
--- a/editor/app.js
+++ b/editor/app.js
@@ -2540,7 +2540,7 @@ async function renderMapDetail(dirName) {
             const body = header.nextElementSibling;
             if (body) body.classList.toggle('collapsed');
             const arrow = header.querySelector('.toggle-arrow');
-            if (arrow) arrow.textContent = body.classList.contains('collapsed') ? '▶' : '▼';
+            if (arrow) arrow.innerHTML = body.classList.contains('collapsed') ? '▶' : '▼';
         });
     });