Thank you for your feedback.
I am the Teacher.
I installed for all users.
I have Administrator Profile and one additional admin rights profile that the students use. This is the profile that is not letting library work.
The folder location is identical al working profiles and computers.
I uninstalled and reinstalled again. I deleted all app data including the library folder. To no avail.
Weirdly it shows 44 results when I mouse over the search bar, but they do not show.
I may have to migrate it to another computer