Change subtitle and closed captioning options in DVD Player on Mac
If your DVD provides them, you can use subtitles and interactive menus in different languages. If your DVD includes closed captions, you can view them instead of subtitles.
Show or hide subtitles
In the DVD Player app
on your Mac, start playing a movie. Choose Features > Subtitles, then select a language. You can also tap the Subtitles button 
in the Touch Bar to see a list of available Subtitles options.
For some discs, you may need to use the disc’s interactive menus to turn on and choose subtitles.
Turn closed captioning on and off
In the DVD Player app on your Mac, do any of the following:
Choose Features > Turn On Closed Captioning.
Choose Features > Turn Off Closed Captioning.
Press Option-Command-T.
Customize closed captioning
In System Settings, you can customize the font, color, transparency, and background for closed captioning.
On your Mac, choose Apple menu
in the sidebar, then click Captions on the right. (You may need to scroll down.)Select one of the default styles:
Transparent Background
Classic
Large Text
Outline Text
To create your own style, click the Add button
, then select your settings.
The changes you make in System Settings are displayed in DVD Player.