If you're looking to manually enable or disable Night Shift on your Mac running macOS Sierra, there are two ways to do it. In the same System Preferences section used to turn Night Shift on, you'll also find an option to adjust the color temperature of the feature to your liking.

By default, the temperature is set to the middle, but if you drag the slider to the left, you'll get more blue light, and if you drag it to the right, you'll get a deeper yellow shade with less blue light. Apple warns that using the warmer end of the spectrum could affect the appearance of some onscreen motion.

With a custom setting, Night Shift will turn on and off at the same time each night based on the time that you choose. The 'Custom' option lets you choose a specific start and end time for Night Shift to turn on. This option requires your location to be enabled in Security & Privacy Preferences so your Mac knows where you are in the world.

It's based on your local sunset and sunrise times. To access these options, follow these steps:

* From the menu bar, click on the Apple icon and select System Preferences.

* Click on the 'Display' tab and then click on the 'Night Shift' option.

* In this menu, you'll see three tabs: Display, Color, and Night Shift.

You can also schedule Night Shift to turn on automatically each night when the sun sets and turn off when the sun rises using the 'Sunset to Sunrise' option. Alternatively, you can choose a custom start and end time for Night Shift using the 'Custom' option.

It's worth noting that while Apple has not officially confirmed Dark Mode for macOS Sierra or iOS 10, some developers have discovered app-level support for Dark Mode in iOS 10. While this does not necessarily mean that Dark Mode will be implemented system-wide, it could suggest that Apple is at least testing the feature internally.

Overall, Night Shift provides a convenient way to adjust the color temperature of your Mac's display to reduce eye strain and improve sleep quality. By following these steps, you can customize the feature to suit your needs and preferences.

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