<clr-modal [(clrModalOpen)]="opened" [clrModalSize]="'sm'">
...
</clr-modal>

<clr-modal [(clrModalOpen)]="opened" [clrModalSize]="'lg'">
...
</clr-modal>

<clr-modal [(clrModalOpen)]="opened" [clrModalSize]="'xl'">
...
</clr-modal>