diff --git a/frontend/app.js b/frontend/app.js
index 3aeb226..d52a790 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -55,7 +55,7 @@
   let outlineObserver = null;
   let activeHeadingId = null;
   let headingsCache = [];
-  let rightSidebarVisible = true;
+  let rightSidebarVisible = false;
   let rightSidebarWidth = 280;
 
   // ---------------------------------------------------------------------------