angular traverses the button button through ngfor. How to click on an input box that appears after him. I click on one now, and all input boxes appear
< ng-container matColumnDef= "operate" >

    <th mat-header-cell *matHeaderCellDef></th>
    <td mat-cell *matCellDef="let row">
      <button mat-button  (click)="onOpenEdit(row)"></button>
      <button mat-button (click)="onDelete(row.id)"></button>
      <input *ngIf="isShow"  [(ngModel)]="row.newsName" name="newsName">
      <button *ngIf="isShow"></button>
    </td>
  </ng-container>

how to click a button appears only one button, the other does not appear