APP properties user

Hello friends, how can I activate in app properties the user properties? They don't appear in any way, I would like to make reference in a label to the username.

@edwarleandro0 : can you try and use this calculation in a hiddent variable to get the user name of the user :

instance('casedb')/casedb/case[@case_type = 'commcare-user'][hq_user_id = instance('commcaresession')/session/context/userid]/username