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: