<mat-cell *matCellDef="let policyType">
<mat-icon matTooltip="Properties">{{isInstancesShown(policyType) ? 'expand_less' : 'expand_more'}}
</mat-icon>
<mat-cell *matCellDef="let policyType">
<mat-icon matTooltip="Properties">{{isInstancesShown(policyType) ? 'expand_less' : 'expand_more'}}
</mat-icon>