I found only a function where I can mark an episode as seen or unseen, but is there also a function to mark a complete tv show as seen or unseen. I have played accidently some tv shows and now it is in the Play Next List. I want to delete the tv show from the Play Next list.
Yes, while browsing the library > TV Shows section you can long-press on a series poster to mark or unmark the entire series as watched.
Unfortunately, the ability to manually remove items from the Up Next List is not currently available, but this is something we plan to look into for a future update.