form_mode_manager-8.x-1.x-dev/modules/examples/form_mode_manager_examples.routing.yml

form_mode_manager_examples.front_page:
  path: '/form_mode_manager_examples'
  defaults:
    _controller: '\Drupal\form_mode_manager_examples\Controller\FrontPage::content'
    _title: 'Form Mode Manager examples'
  requirements:
    _permission: 'access content'