SystemModuleTestHooks.php

<?php

declare (strict_types=1);
namespace Drupal\system_module_test\Hook;

use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for system_module_test.
 */
class SystemModuleTestHooks {
    
    /**
     * Implements hook_page_attachments_alter().
     */
    public function pageAttachmentsAlter(&$page) {
        // Remove the HTML5 mobile meta-tags.
        $meta_tags_to_remove = [
            'MobileOptimized',
            'HandheldFriendly',
            'viewport',
            'ClearType',
        ];
        foreach ($page['#attached']['html_head'] as $index => $parts) {
            if (in_array($parts[1], $meta_tags_to_remove)) {
                unset($page['#attached']['html_head'][$index]);
            }
        }
    }

}