Change Captions settings for accessibility on Mac
On your Mac, use Captions settings to control how subtitles are styled, and whether to use closed captions instead, when they’re available. See Use subtitles and closed captions.
To change these settings, choose Apple menu > System Settings, click Accessibility in the sidebar, then click Captions on the right. (You may need to scroll down.)
Available built-in styles (Transparent Background, Classic, Large Text, Outline Text), and styles that you added.
To edit the settings for a style you added, select the style in the list, then click Edit.
Create a style.
Set background and text colors, and font settings. A new style inherits the settings of the style that’s selected when you click Add. If you like many of the settings of an existing style, select it before you click Add, then change just the settings you don’t like.
To have a setting always used, deselect its “Allow video to override” checkbox. In the bottom section, you can also set a font to use to override another font every time it’s used in subtitles. For example, set the font to use instead of Cursive whenever Cursive is used in subtitles.
Delete a style that you added.
Prefer closed captions and SDH
If they’re available, use closed captions or subtitles for the deaf and hard of hearing (SDH) instead of standard subtitles for content played on your Mac.
Tip: The Outline Text style is especially useful for subtitles and captions that appear in Japanese.