Can't access element binding fields when creating Action/Operation

Steps to reproduce:

• Follow steps indicated in this tutorial https://doc.nuxeo.com/nxdoc/how-to-insert-user-action
• On this step https://doc.nuxeo.com/nxdoc/how-to-insert-user-action/#bind-the-action-to-an-element, the necessary fields are missing.
  (see screenshots)