/** @var \Drupal\layout_builder\SectionStorageInterface $field_list */
$field_list = $this->entity->get('layout_builder__layout');
$field_list->appendSection(new Section('layout_onecol'));
/** @var \Drupal\layout_builder\SectionStorageInterface $field_list */
$field_list = $this->entity->get('layout_builder__layout');
$field_list->appendSection(new Section('layout_onecol'));