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.
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@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
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