Thanks will do. Seems though that the reason to present the field would be to allow you to change the author to another user. I can’t find any other way to allocate an existing user as the page author now.
I am also unable to remove the user, they are no longer listed under All Users.
User is SSO so not a WordPress registered user. Tried basic sidebar edit and quick edit. Also code editor. Looks like the author dropdown is hidden when it can’t find the user. I can see the user in the Author column in Pages view but the field is missing in Edit. If the user exists in our system, the Author field is visible in Edit.