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

# Admin UI - Settings links.
form_mode_manager.admin_settings:
  title: 'Form Mode Manager'
  description: 'Configure common settings for Display modes.'
  parent: system.admin_config_content
  route_name: form_mode_manager.admin_settings

# Admin UI - Local tasks
form_mode_manager.admin_settings_links_task:
  title: 'Local task settings'
  description: 'xxx'
  weight: -10
  parent: form_mode_manager.admin_settings
  route_name: form_mode_manager.admin_settings_links_task