diff --git a/packages/layout-design/src/design-index-view/components/design-left-menu/design-left-menu.scss b/packages/layout-design/src/design-index-view/components/design-left-menu/design-left-menu.scss
index 6905cbc3a407b20ee491ec51126fa297b7c67a21..4c506fb403aec49075f706043d0732bdb54019fc 100644
--- a/packages/layout-design/src/design-index-view/components/design-left-menu/design-left-menu.scss
+++ b/packages/layout-design/src/design-index-view/components/design-left-menu/design-left-menu.scss
@@ -4,6 +4,7 @@
   height: 100%;
 
   @include e(side-container) {
+    flex: none;
     width: 48px;
     height: 100%;
     overflow: auto;