group-8.x-1.x-dev/group.links.menu.yml

system.admin_group:
  title: 'Groups'
  description: 'Find and manage groups, group types and group settings.'
  route_name: 'entity.group.collection'
  parent: 'system.admin'
  weight: 3

entity.group.collection:
  title: 'List'
  description: 'Find and manage groups, group types and group settings.'
  route_name: 'entity.group.collection'
  parent: 'system.admin_group'

entity.group_type.collection:
  title: 'Group types'
  description: 'Configure group types.'
  route_name: 'entity.group_type.collection'
  parent: 'system.admin_group'
  weight: 5

group.settings:
  title: 'Settings'
  description: 'Configure the general group module settings.'
  route_name: 'group.settings'
  parent: 'system.admin_group'
  weight: 10