I have a LG C9 with the preview channel enabled for the Plex app. Is there an option to chose which libraries are considered for the screensaver? I got a lot of libraries with ■■■■■■ fanart (e.g video courses for Java development) and I would like to exlude them.
Try this:
edit the unwanted library(s), go to the ‘Advanced’ tab and set “Visibility” to “Exclude from Home Screen”.
Of course, this could have unwanted side effects.