It will do no such thing.

*Never Seemed

In Jellyfin, if you add the Star Wars movies to a collection named Star Wars, then do the same to the TV Shows, and then open the Star Wars collection, it will show you the movies and the shows. You could probably do the same for the books after you install the book library plugin, though I don’t think Jellyfin is the ideal way to read ebooks.

What do you mean? This IS the testing!