Invisible elements inside Reference Selector

Hello. I have finished the learning path Learning Paths/ Constrain Your Data Using XPath/Using more complex constraints. But why I can not see the users in the Reference Selectors (selection box) in the end? The values are there but I can not see them. How should I configure the reference selector widget?
1 answers

Could you send a picture of the setup you have on your reference selector? at first glance, my guess would be that you have the display attribute as a null field for the entity. For example, when I set up a reference selector in a recent project of mine I did the following:

So if you picked a different field inside of your entity that is empty inside your database, it will show up but with no display value. If that is not the case, I would check the access rules, but that would give you no results and is unlikely