The System App Preferences offers settings options for the standard Xiaomi smartphone apps, including: updates for System Maps, Tasks, Notes, Quick Apps, Cloud, Call Preferences, Contacts, Messages, Calendar, Security, Camera, Photos, Music, Browser, Recorder.

Here we can make app-specific settings, such as sorting contacts in the Contacts app, or (de)activating call forwarding in the call settings.

Note: In this guide we will only navigate to the overview mentioned above, further options are available after selecting the app.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Apps
Step 3:  Tap on  System app settings
Step 4:  Choose an  app
Step 5:  Enable or disable the desired  option
  1. Open the Settings
  2. Tap on Apps
  3. Tap on System app settings
  4. Choose an app
  5. Enable or disable the desired option

Xiaomi Instructions