Users are always shown as logged in!

Hi,
Sorry if this seems trivial to some of you.
I am trying to check on who is logged in or not in my app.

I created a repeating group, simple: the data source search for users (all users).
I am showing the following field: Current cell’s User is logged in:formatted as text (Yes for logged in, No for not logged in).
it shows Yes for all users.
This works well for the current user, but not on other users ?
If this is not the way to check on who is logged in or out, maybe anyone can direct me to the best way to do it.
Thank you
Gerard