Third-party apps can opt to use the Dark Mode option, as well.
Information in this article applies to Macs with macOS Mojave and later.
Apple introduced Dark Mode with macOS Mojave.

While Dark Mode isn’t automatically enabled, it’s easy to turn on and off.
Go to the Apple menu and selectSystem Preferences.
SelectGeneralon the System Preferences screen.

Next toAppearance, selectDarkto turn on Dark Mode.
(SelectLightto return to Light Mode.)
Launch System Preferences and selectDesktop & Screen Saver.

Select theDesktoptab, and then find theDynamic Desktoppictures.
Select a Dynamic Desktop image, then selectDynamicfrom the drop-down menu next to the large thumbnail.
These images move from light to dark as the day progresses.

The desktop changes to show the image you select.
It changes the colors of your display to be warmer after dark.
Night Shift first appeared on iPhones and iPads and came to the Mac with macOS Sierra.

Turn on Night ShiftinSystem Preferences>Displays>Night Shift.



