First seen on Reddit, and reported by 9to5Mac, the app now uses the built-in and redesigned video player that first arrived in tvOS 15. In the player, information like language controls, sound, and more is bundled with he progress bar on the bottom of the page. You can also select and Info button to see more about the show or movie.
Link: Netflix for Apple TV Updated to Use tvOS 15 Video Player
via appadvice.com