We can change the picture quality of the Xiaomi smartphone's camera app. Normally, we always want the highest possible resolution and quality of the photos we take, but sometimes it makes sense to reduce the quality, for example to minimize the file size. We have the following three choices:

Android 10 (MIUI 12.0)
Step 1:  Open the  Camera app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Picture quality
Step 5:  Choose  High ,  Standard  or  Low
  1. Open the Camera app
  2. Open the menu
  3. Open the Settings
  4. Tap on Picture quality
  5. Choose High, Standard or Low

Xiaomi Instructions