LayoutInterface

class \Drupal\Core\Layout\LayoutDefault extends \Drupal\Core\Plugin\PluginBase implements \Drupal\Core\Layout\LayoutInterface, \Drupal\Core\Plugin\PluginFormInterface, \Drupal\Core\Plugin\PreviewAwarePluginInterface uses \Drupal\Core\Plugin\ContextAwarePluginAssignmentTrait, \Drupal\Core\Plugin\ContextAwarePluginTrait
class \Drupal\layout_builder\Plugin\Layout\BlankLayout extends \Drupal\Core\Layout\LayoutDefault
class \Drupal\layout_builder\Plugin\Layout\MultiWidthLayoutBase extends \Drupal\Core\Layout\LayoutDefault implements \Drupal\Core\Plugin\PluginFormInterface
class \Drupal\layout_builder\Plugin\Layout\ThreeColumnLayout extends \Drupal\layout_builder\Plugin\Layout\MultiWidthLayoutBase
class \Drupal\layout_builder\Plugin\Layout\TwoColumnLayout extends \Drupal\layout_builder\Plugin\Layout\MultiWidthLayoutBase
class \Drupal\navigation\NavigationLayout extends \Drupal\Core\Layout\LayoutDefault