You can turn your F6000F TV’s Closed Captions on/off and change the settings, such as separating it from the broadcast screen, font color, background color, size, position, language, etc., by going to: Settings > All Settings > General & Privacy > Accessibility > Caption Settings.
If captions are greyed out and you are using a Streaming app, you will need to use the caption settings within the app.
~Samsung Advisor