How to do screen pinning in MIUI 10 ?

1. Install Settings Database Editor by 4A.
2. Open App and go to System Table.
3. Click Add new setting and type lock_to_app_enabled.
4. Click Save.
5. Now you will be asked to Input Value.
6. Type 1 (Turn ON) or 0 (Turn OFF).

Press Power + Home to unpin an app.