ad_entity.routing.yml

ad_entity.settings:
  path: '/admin/structure/ad_entity/global-settings'
  defaults:
    _form: '\Drupal\ad_entity\Form\GlobalSettingsForm'
    _title: 'Global settings for Advertising entities'
  requirements:
    _permission: 'administer ad_entity'
  options:
    _admin_route: TRUE