<mat-icon>dashboard</mat-icon> <span class="nav-caption">Policy</span>
<mat-icon *ngIf="showSubMenu">expand_more</mat-icon>
<mat-icon *ngIf="!showSubMenu">chevron_right</mat-icon>
</a>
<mat-nav-list [ngClass]="{'dark': darkMode}" *ngIf="showSubMenu">
<mat-icon>dashboard</mat-icon> <span class="nav-caption">Policy</span>
<mat-icon *ngIf="showSubMenu">expand_more</mat-icon>
<mat-icon *ngIf="!showSubMenu">chevron_right</mat-icon>
</a>
<mat-nav-list [ngClass]="{'dark': darkMode}" *ngIf="showSubMenu">