Subtitles when renting a movie

youll need to look here for instructions: Change subtitles or languages for videos in the Apple TV app or iTunes Store - Apple Support

• Or on a remote for a smart TV, streaming device, or game console, press the button that brings up the video timeline.
• navigate to the Subtitles button .

I’m looking on the iPad, it depends which Device you’re using but the Icon is shown here to turn off