Impact of MultiUser on Oculus Platform Tools

We have an app currently available on the Store. We had initially opted out of multi user app sharing, but are interested in implementing it.

I can't find any documentation about how this is expected to work.  Mostly, I am interested in the following methods:
https://developer.oculus.com/reference/platform/v25/o_v_r_requests_user_8h/#a2c6a612f691e1009621c21d17b48c8d3
ovr_User_Get (ovrID userID)
ovr_User_GetUserProof ( )

Do they return the values of the "selected" user? Or of the admin user?  If it's the "selected" user, I assume that IsUserEntitledToApplication() will be overidden?

Similarly, what will happen with leaderboards? In the "learn more" section of the headset, it refers to unique leaderboards, but it also seems that it isn't the case when using some other apps that have already enabled this feature.

It would be great if that was cleared up somewhere.