admin_toolbar-8.x-2.x-dev/admin_toolbar.routing.yml

admin_toolbar.settings:
  path: '/admin/config/user-interface/admin-toolbar'
  defaults:
    _form: '\Drupal\admin_toolbar\Form\AdminToolbarSettingsForm'
    _title: 'Admin Toolbar settings'
  requirements:
    _permission: 'administer site configuration'