diff --git a/apps/client/src/widgets/buttons/left_pane_toggle.css b/apps/client/src/widgets/buttons/left_pane_toggle.css
index b40fcc420..5f278b945 100644
--- a/apps/client/src/widgets/buttons/left_pane_toggle.css
+++ b/apps/client/src/widgets/buttons/left_pane_toggle.css
@@ -14,6 +14,10 @@
     }
 }
 
+.layout-vertical .left-pane-toggle-button::before {
+    display: block;
+}
+
 .layout-vertical .left-pane-toggle-button.action-collapse::before {
     transform: rotate(360deg);
     animation: left-pane-toggle-button-collapse 600ms ease-in-out;