diff --git a/sao/src/sao.less b/sao/src/sao.less
index 1b7db4f0a3..cb2f9b2f14 100644
--- a/sao/src/sao.less
+++ b/sao/src/sao.less
@@ -308,10 +308,11 @@ html[theme="default"] {
 
                 > div {
                     display: inline-flex;
-                    width: 100%;
+                    flex: 1 1 0;
+                    min-width: 0;
 
                     &:first-child {
-                        flex: 2;
+                        flex-grow: 2;
                     }
                 }
             }
@@ -328,7 +329,6 @@ html[theme="default"] {
         border-color: @panel-default-border;
         border-style: solid;
         border-width: 0 0 0 1px;
-        flex: 1;
         overflow: unset;
 
         .sidebar-resizer {