diff --git a/frontend/src/components/Sidebar.tsx b/frontend/src/components/Sidebar.tsx
index c625f5c..4874d47 100644
--- a/frontend/src/components/Sidebar.tsx
+++ b/frontend/src/components/Sidebar.tsx
@@ -101,6 +101,10 @@ export default function Sidebar() {
   const handleMouseLeave = () => {
     hoverTimeoutRef.current = setTimeout(() => {
       setIsHovered(false);
+      // In toggle mode, collapse sidebar when mouse leaves (if expanded)
+      if (sidebarMode === 'toggle' && !isCollapsed && !isMobileOpen) {
+        toggleCollapse();
+      }
     }, 100);
   };