a12s-1.0.0-beta7/modules/layout/a12s_layout.links.menu.yml

entity.a12s_layout_display_options.collection:
  title: Display options
  parent: system.themes_page
  description: 'Overview of display options instances.'
  route_name: entity.a12s_layout_display_options.collection

a12s_layout.display_options.settings:
  title: Settings
  parent: entity.a12s_layout_display_options.collection
  description: 'Display options global settings.'
  route_name: a12s_layout.display_options.settings