On admin/content, I have created different views for articles and basic pages (the default content types created from Drupal). On admin/content, it shows *Content | Article | Basic Page*. When I already have *Article* and *Basic page* as separate.

On admin/content, I would like to show as Blank means no data instead of showing all data.

I tried the following code.

`modules/custom/content/src/Routing/RouteSubscriber.php`

    namespace Drupal\content\Routing;
    
    use Drupal\Core\Routing\RouteSubscriberBase;
    use Symfony\Component\Routing\RouteCollection;
    
    /**
     * Listens to the dynamic route events.
     */
    class RouteSubscriber extends RouteSubscriberBase {
    
      /**
       * Used to alter routes.
       */
      protected function alterRoutes(RouteCollection $collection) {
        if ($route = $collection->get('system.admin_content')) {
          $route->setDefaults(array(
            '_controller' => '\Drupal\content\Controller\ContentOverviewController::overview',
          ));
        }
      }
    
    }

I'm trying to override its default controller, so it show blank.

The code for the controller is the following one.

    namespace Drupal\content\Controller;
    
    use Drupal\system\Controller\SystemController;
    
    /**
     * Class ContentOverviewController.
     */
    class ContentOverviewController extends SystemController {
    
      /**
       * Content Overview.
       */
      public function overview($link_id) {
    
        $build = [
          '#markup' => $this->t('Hello World!'),
        ];
        return $build;
      }
    
    }

The code doesn't seem to work.

I also tried to disable the content view, but that is not needed.