diff --git a/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html b/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html
index 73c887e5..a702220d 100644
--- a/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html
+++ b/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html
@@ -27,11 +27,10 @@
       class="tree-node-frame"
       style="height: 80px;"
     >
-      <li class="tree-node-header">
+      <li class="tree-node-header" matTreeNodeToggle>
         <div class="path">
           <button
             mat-icon-button
-            matTreeNodeToggle
             [attr.aria-label]="'toggle '"
             class="btn-toggle"
           >