What is "Screen Lock"? How do I set a "Destruction Password"?
You can go to "Security Center" -> "Lock Screen Protection".
Once enabled: After the App runs in the background or the screen is locked, re-opening it will require password or Face ID verification.
Destruction Password: You can set a special "Destruction Password".
Warning: When you unlock using this password, the system will permanently delete all local records; this action is irreversible, please set it with caution.