Infuse + Plex: Media library do nit display the cover picture

I use Infuse to connect with both Jellyfin and Plex.

As you can see, the library of plex do not have a cover picture. I searched all over the plex server but didn’t see the relevant settings. I wounder if there is a setting for this and can i set the cover by my self?

An other problem is there is a library named “playlist” which may be a music library file. It should not diaplay in Infuse, but i can’t delete it.

Looking forward to your reply!