fences-8.x-2.0-rc1/fences.links.menu.yml

fences.overview:
  title: 'Fences'
  route_name: fences.overview
  parent: system.admin_config_ui
  description: 'Configure fences related functionalities.'

fences.settings:
  title: 'Settings'
  parent: fences.overview
  route_name: fences.settings
  description: 'Configure fences settings.'