Netflix supports two High Dynamic Range (HDR) video formats, Dolby Vision and HDR10. If your Mac meets the requirements below, TV shows and movies available in HDR will display the HDR or DV icon next to their description.
To play HDR content on your Mac computer, you need:
The latest version of the Safari browser
A compatible Mac model with an HDR-capable display
macOS Catalina 10.15.4 or later
If using a cable or adapter, it must support HDR
The Apple XDR Display preset or High Dynamic Range checkbox turned on in System Preferences > Display
The Optimize video streaming while on battery option turned off in System Preferences > Battery