diff --git a/ui/scss/core/sim_ui/_sidebar.scss b/ui/scss/core/sim_ui/_sidebar.scss
index 975afca5f6..8666b91cf4 100644
--- a/ui/scss/core/sim_ui/_sidebar.scss
+++ b/ui/scss/core/sim_ui/_sidebar.scss
@@ -3,6 +3,7 @@
 @import "../components/sim_title_dropdown";
 
 .sim-sidebar {
+  flex: 1;
   display: flex;
   flex-direction: column;
   align-items: stretch;