How do I set and change Always On Display feature on Nougat OS?

You can set the device to display information, such as a clock, calendar, or image, on the screen when it is turned off.

1. From the Apps screen, tap Settings.

Tap the switch to activate it.

To choose between the content to show (Clock, Calendar and Image)

Choose between the three choices (Clock, Calendar and Image)

If you choose "Clock" layout from "Content to show", you would be able to choose the color and the background for the Clock layout.

Choose the color

Choose the background

Then Tap Apply.