https://api.drupal.org/api/drupal/core%21modules%21layout_builder%21src%21LayoutBuilderEvents.php/class/LayoutBuilderEvents/10
class LayoutBuilderEvents | Drupal API
classdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21layout_builder%21src%21LayoutBuilderEvents.php/constant/LayoutBuilderEvents%3A%3ASECTION_COMPONENT_BUILD_RENDER_ARRAY/9
LayoutBuilderEvents::SECTION_COMPONENT_BUILD_RENDER_ARRAY | Drupal API
sectioncomponentbuildrenderarray