Change which DB object is enrollable 'user' object

In our use case, we’ll have a single device shared among several users that can log in with their own unique user IDs and passwords.
In the old app editor you could specify which DB object in the data model was then enrollable ‘user’ object, but I’m not seeing an option to set this in Oxide.
Where would I go, or what setting would I change, to set ‘device’ as the DB object that gets enrolled?

This can be changed in the application.xml file (which can be opened via the CMD Pallet). See the mobile_user element. Changes will only apply on a deploy.

Thanks Kobie, much appreciated.