diff --git a/packages/studio-theme/src/theme/studio-dark/ctrl.scss b/packages/studio-theme/src/theme/studio-dark/ctrl.scss
index 55a25b6a032b1121b2bcc5e01f9575b3c166de74..da4d1a4046ceb02134c1de3538ad7da54056a710 100644
--- a/packages/studio-theme/src/theme/studio-dark/ctrl.scss
+++ b/packages/studio-theme/src/theme/studio-dark/ctrl.scss
@@ -454,5 +454,9 @@
 
       margin: getCssVar(spacing, none);
     }
-  } 
+  }
+
+  @include b(control-treeexpbar) {
+    min-width: 100px;
+  }
 }