SettingsTrayFormAnnotationIsFalseBlock.php

<?php

declare (strict_types=1);
namespace Drupal\settings_tray_test\Plugin\Block;

use Drupal\Core\Block\Attribute\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Block that explicitly provides no "settings_tray" form, thus opting out.
 */
class SettingsTrayFormAnnotationIsFalseBlock extends BlockBase {
  
  /**
   * {@inheritdoc}
   */
  public function build() {
    return [
      '#markup' => '<span>FALSE</span>',
    ];
  }

}