Hi BetsyW, thank you for clarifying. Below are the steps to turn off Subtitles on your device.
Turn On Subtitles on Amazon Fire TV
You can turn on subtitles ("CC") on your Amazon Fire TV to display the audio for movies and TV shows as text on-screen.
Prime Video movies and TV shows with subtitles available typically feature a "CC" symbol in the video details.
Most videos that support subtitles include English text; however other languages may also be available. To view available languages, open the video details for a movie or TV show and look for the Subtitles section.
To watch Prime Video movies and TV shows with subtitles:
Start playing the video.
Press the Menu button on your Fire TV remote or the Fire TV Remote App.
Select Subtitles and Audio.
Select the Off button under Subtitles and Captions. Then select an available subtitle language from the options on-screen to turn captions on.
Tip: You can then set preferences for the way subtitles display, including text size and style. You'll see a sample of your selected options on-screen.
Press the Menu button again to return to video playback with subtitles on.
To turn subtitles off, press the Menu button, re-open Subtitles and Audio, and select your currently enabled captions option. You'll then see an option to set subtitles to Off.
Note: You can change how subtitles text appears for movies and TV shows you watch from the Netflix app in your Netflix account settings (http://www.netflix.com/youraccount). Just look for the Subtitles Appearance option. Other video apps may also have preferences you can set for subtitles and captions.