group_content_menu-8.x-1.0-rc3/group_content_menu.links.contextual.yml

entity.group_content_menu.edit_form:
  route_name: entity.group_content_menu.edit_form
  group: group_menu
  title: Edit menu

entity.group_content_menu.delete_form:
  route_name: entity.group_content_menu.delete_form
  group: group_menu
  title: Delete menu
  weight: 10