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As with the Google Phone or Contacts app, we can specify whether the Messages app on the Oppo smartphone should be displayed in a light or dark theme, which reduces battery consumption and is easier on the eyes.

Android 11 | ColorOS 11.0 | Google Messages
Step 1: Tap on  Messages
Step 2: Open the  Menu
Step 3: Tap on  Choose theme
Step 4: Choose  Light  or  Dark  and tap on  OK
  1. Tap on Messages
  2. Open the Menu
  3. Tap on Choose theme
  4. Choose Light or Dark and tap on OK
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Oppo Instructions