every plex account user has their own choice to use or hide the plex online media.
the only users which you can control are ‘managed home users’, which are a subprofile of your plex account (ie they do not have their own plex account).
please read extended discussion @ Please let me pay you money so I can have control over my media server again
and probably many other posts in the online media section @ https://forums.plex.tv/c/online-media-sources/121
