This article explains how to turn on and off closed captioning on Apple TV. Closed captioning is a huge help for viewers with hearing impairments or if you're watching something in a language you don't speak. Not every app supports closed captioning in the same way, but here's how to use the ones that do.
How to Turn Subtitles On/Off on Apple TV
To turn on subtitles in a compatible app on Apple TV, follow these steps:
Start playing the video you want to watch.
Swipe down or press the down arrow button on the Apple TV remote to reveal the menu at the top of the screen.