next-ucap-messenger/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html

<mat-accordion>
  <mat-expansion-panel *ngFor="let buddyInfo of buddyInfoList$ | async">
    <mat-expansion-panel-header>
      <mat-panel-title> {{ buddyInfo.name }} </mat-panel-title>
      <mat-panel-description
        >{{ buddyInfo.employeeNum }}
      </mat-panel-description>
    </mat-expansion-panel-header>
  </mat-expansion-panel>
</mat-accordion>