Google is enhancing Google Docs, Sheets and Slides on Android with Dark theme support. Dark theme will intelligently adjust the product interface and user-generated content in ways that can make it more usable in low-light environments and save battery life.
Settings for Docs, Sheets, and Slides will adjust automatically when the Android system is set to use Dark theme. You can also turn dark mode on or off for Docs, Sheets or Slides independently. If you do this, each app will always be in the selected theme regardless of the Android system settings.
This feature will automatically respect the Android system settings. Dark theme can also be enabled in the Docs, Sheets, or Slides apps individually by going to Menu > Settings > Theme > Dark in each app. When using Dark theme, you can preview your current document or sheet in the Light theme using More > View in light theme.
The new feature is rolling out now to all G Suite customers and users with personal accounts.