entity.block.edit_form: title: 'Configure block' route_name: entity.block.edit_form base_route: entity.block.edit_form # Per theme block layout pages. block.admin_display: title: 'Block layout' route_name: block.admin_display base_route: block.admin_display block.admin_display_theme: title: 'Block layout' route_name: block.admin_display_theme parent_id: block.admin_display deriver: 'Drupal\block\Plugin\Derivative\ThemeLocalTask'