field_ui.links.menu.yml

field_ui.list:
  title: 'Field list'
  description: 'Overview of fields on all entity types.'
  route_name: field_ui.list
  parent: system.admin_reports

field_ui.display_mode:
  title: 'Display modes'
  description: 'Configure what displays are available for your content and forms.'
  route_name: field_ui.display_mode
  parent: system.admin_structure

field_ui.entity_view_mode_list:
  title: 'View modes'
  description: 'Manage custom view modes.'
  route_name: field_ui.entity_view_mode_list
  parent: field_ui.display_mode

field_ui.entity_form_mode_list:
  title: 'Form modes'
  description: 'Manage custom form modes.'
  route_name: field_ui.entity_form_mode_list
  parent: field_ui.display_mode