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To prevent an app from closing in the background, we can fix or lock apps. This previously worked in MIUI via a lock on recent apps, which is no longer possible on some Xiaomi devices.

Now we have to start the "Security" app and navigate to the boost speed settings to enable locking of each individual app.

Android 11 | MIUI 12.0
Step 1: Tap on  Security
Step 2: Tap on  Settings
Step 3: Tap on  Boost speed
Step 4: Tap on  Lock apps
Step 5: Turn On/Off an  App
  1. Tap on Security
  2. Tap on Settings
  3. Tap on Boost speed
  4. Tap on Lock apps
  5. Turn On/Off an App
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Xiaomi Instructions