5 years later and this feature is still missing.
I just created a feature request “Know quickly who can access to one library” because sometimes we just want a reminder about who have access to this library
… But I will close it as it duplicates this request …
For now, to know who can access to one library, we have to open one by one each user to know which library they can access.
Managing one library, using the option 3 dots > Share, the window directly ask us to add a new user.
It would be good instead, to display the list of current users having access, followed by a text field to add a new user if needed.
Few hopes at it seems Plex is dying with no evolution anymore …
