::ng-deep {
  .mdc-tab__content {
    // display: flex;
    // align-items: center;
    // justify-content: center;
    // height: inherit;
    // pointer-events: none;
    width: 100%;
  }
  .mat-mdc-tab .mdc-tab__text-label {
    // color: var(--mat-tab-inactive-label-text-color, var(--mat-sys-on-surface));
    // display: inline-flex;
    // align-items: center;
    width: 100%;
  }
}

After adding above css I am able to achive customm header with full width. Angular 20