We can (de)activate notifications on the lock screen of the Xiaomi smartphone in general, for example, if you want to avoid prying eyes and protect your privacy, but when we deactivate
them, we don't get pop-up notifications on the lock screen, only icons in the status bar of the device.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Notifications
Step 3:  Tap on  Lock screen notifications
Step 4:  Tap on  Format
Step 5:  Choose  Show notificaction content  or  Don´t show Lock screen notifications
  1. Open the Settings
  2. Tap on Notifications
  3. Tap on Lock screen notifications
  4. Tap on Format
  5. Choose Show notificaction content or Don´t show Lock screen notifications

Xiaomi Instructions