Try the Beta to Use Night Mode
One of the best features from the new One UI is coming to the Galaxy Note 8 and if you want to use it right now you'll want to install the Android Pie beta.
The new One UI comes with a brand new Night Mode that makes the Galaxy Note 8's screen easier on your eyes. It will also help you conserve battery life.
When Night Mode is active you'll also notice changes across the user interface. Most stock Samsung apps are compatible with the new mode.
You can manually turn Night Mode on whenever you want to use it or you can also schedule when you want the device to turn Night Mode on. There's also a way to set it so the device automatically turns it on when you're in the dark.
It's one of our favorite One UI features.