Now you can choose between a dark or light theme for the app. This setting will only affect this mail app and change any other phone settings.
1. Tap the SideMenu icon at the top of your navigation bar to open the Side Menu.
2. Tap the Gear icon at the bottom of the Side Menu to bring up Settings.
3. Tap Appearance.
4. Tap Theme.
5. Tap to select between Light, Dark and System Default.
Note: The app background will change instantaneously.