openvidu/openvidu-components-angular/projects/openvidu-angular/src/lib/components/panel/panel.component.html

<!-- CHAT panel -->
<ng-content select="[chatPanel]" *ngIf="isChatPanelOpened"></ng-content>

<!-- PARTICIPANTS panel -->
<ng-content select="[participantsPanel]"  *ngIf="isParticipantsPanelOpened"></ng-content>