Prevent mat-expansion panel from toggling when mat-checkbox in Header clicked
You can call the stopPropagation $event method when mat-checkbox is clicked:
<mat-expansion-panel-header> <mat-panel-title> Panel Title </mat-panel-title> <mat-panel-description> <mat-checkbox (click)="$event.stopPropagation();">Edit</mat-checkbox> </mat-panel-description></mat-expansion-panel-header>