libraries unavailable when adding them to a new user

hello,

I used plex since many month and it works fine, but recently I decided to add a restricted rights user, and I can’t make it work : when I create a new user (a managed user), I can’t add libraries to this user (please have a look at the picture, in french although).
I also removed the “home” and I can’t get it again…

I can provide you with more informations if needed.

thank you