Include Buttons and Paginator in the Material Table Footer
Finally, I used a toolbar, if someone has the same problem:
</table>
<mat-toolbar>
<mat-toolbar-row>
<mat-icon (click)="exportCsv(dataSource)" title="Export as CSV">save_alt</mat-icon>
<span class="example-spacer"></span>
<mat-paginator class="paginator" [pageSizeOptions]="[5, 10, 20]"></mat-paginator>
</mat-toolbar-row>
</mat-toolbar>
</div>
that gave: