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 3005d642..ae10329a 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
@@ -1,8 +1,4 @@
-<mat-accordion
-  #groupAccordion="matAccordion"
-  [multi]="true"
-  [displayMode]="'flat'"
->
+<mat-accordion #groupAccordion="matAccordion" [multi]="true">
   <mat-expansion-panel
     *ngIf="favoritBuddyList.length > 0 && !checkable"
     [togglePosition]="'before'"