When we surf the Internet with our Xiaomi smartphone in the evening, we can activate the night mode if desired, which changes light colors from various websites and browser menu functions to dark color themes to make it easier to use and make surfing more eye-friendly.

Android 10 (MIUI 12.0)
Step 1:  Open the  Mi Browser app
Step 2:  Tap on  Profile
Step 3:  Enable or disable  Dark mode
  1. Open the Mi Browser app
  2. Tap on Profile
  3. Enable or disable Dark mode

Xiaomi Instructions