RenderCallbacks.php

<?php

declare (strict_types=1);
namespace Drupal\navigation;

use Drupal\Core\Security\Attribute\TrustedCallback;
use Drupal\navigation\Plugin\SectionStorage\NavigationSectionStorage;

/**
 * Defines a class for render element callbacks.
 *
 * @internal
 */
final class RenderCallbacks {
    
    /**
     * Pre-render callback for layout builder.
     */
    public static function alterLayoutBuilder(array $element) : array {
        if (($element['#section_storage'] ?? NULL) instanceof NavigationSectionStorage) {
            // Remove add section links that exist before and after the existing
            // section.
            unset($element['layout_builder'][0], $element['layout_builder'][2]);
            // Remove add block link from the footer section and the remove and
            // configure buttons from the existing section.
            unset($element['layout_builder'][1]['remove'], $element['layout_builder'][1]['configure'], $element['layout_builder'][1]['layout-builder__section']['footer']['layout_builder_add_block']);
        }
        return $element;
    }

}