Example shows 5 items per row:
<div *ngFor="let item of items; let i = index">
<div *ngIf="i % 5 == 0" class="row">
{{ item }}
<div *ngIf="i + 1 < items.length">{{ items[i + 1] }}</div>
<div *ngIf="i + 2 < items.length">{{ items[i + 2] }}</div>
<div *ngIf="i + 3 < items.length">{{ items[i + 3] }}</div>
<div *ngIf="i + 4 < items.length">{{ items[i + 4] }}</div>
</div>
</div>