Mac storage basics · Photos, music and video
How do I remove downloaded movies and TV shows from my Mac?
Short answer: In the TV app's Downloaded section, right-click an item and remove the download; purchases stay in your library. Optimise Storage in Storage settings removes watched ones automatically.
In the TV app, go to Downloaded, then right-click a movie or episode and choose Remove Download (wording varies by version). Purchases stay in your library and can be downloaded again.
To do it automatically, turn on Optimise Storage in System Settings → General → Storage, which removes Apple TV movies and shows you've already watched.