How can I remove episodes I've watched from my YouTube TV library?

To remove episodes you've watched from your YouTube TV library, navigate to the 'Library' tab where all your saved shows and movies are listed. Find the show from which you want to delete episodes and select it to view all episodes you have added to your library. Hover over the episode or click on the three-dot menu next to the specific episode you want to remove and look for an option such as "Remove from library" or a similar prompt, which allows you to delete that particular episode. Confirm your choice, and the episode will be removed from your library. It's important to keep in mind that interfaces and options may vary slightly based on the device being used, but generally, this is how one could manage watched content within YouTube TV's library.