Install for Night Mode
Night Mode is one of our favorite changes from the new One UI and it's a great reason to install Android Pie soon after it arrives for your phone.
When Night Mode is active, your display should be a lot easier on your eyes. It'll also help you conserve battery life.
With Night Mode on you'll also notice changes across the Galaxy Note 9's user interface. Most stock Samsung apps, including Bixby, are compatible with Night Mode.
You can manually turn Night Mode on whenever you want to use it. You can also schedule it to automatically turn on.