Use subtitles and closed captions on Mac
You can customize the display of subtitles and captions, and choose to use subtitles for the deaf and hard of hearing (SDH) or closed captions, whenever they’re available.
Tip: If your Mac supports it, you can turn on live captioning of audio so you can follow along more easily with conversations, audio, and video. See Use Live Captions.
On your Mac, choose Apple menu > System Settings, then click Accessibility in the sidebar. (You may need to scroll down.)
Go to Hearing on the right, then click Captions.
Do any of the following:
Enable closed captions and SDH: Turn on “Prefer closed captions and SDH.”
Stop using closed captions and SDH: Turn off “Prefer closed captions and SDH.”
Create a style: Click the Add button , enter a name for the style, then change settings for the background and text. To have your style setting always used, deselect the “Allow video to override” checkbox.
Edit a style you created: Select the style in the list, then click Edit.
Delete a style you created: Select the style in the list, then click the Remove button .