On every previous release of Plex on the tv shows section there was a “unplayed” tab so you can shortcut into that. now you need to go to tv shows, wait for it to load, then toggle up, select all shows, hit unplayed and return.
I agree with this completely! My standard practice was to use the Unplayed button so it would take 3 steps (Open Plex, Holiday Movies, Unplayed) and now it takes 5+ steps (Open Plex > Movies > Holiday Movies > All Movies > Unplayed (Up Up Right Click Click)). The UI has turned into a special move in Mortal Combat. I was secretly hoping that it could be added somehow next to the “All Movies” button but so far I haven’t found it.
Edit
Another post discusses this in further detail.