Xiaomi
Fingerprint Unlock for App Lock auf Xiaomi
App lock on Xiaomi phones protects individual apps with a separate PIN, pattern, or password, independent of the phone's main lock screen. By default MIUI asks for that password every time you open a protected app, even if you already unlocked the phone with your finger.
Fingerprint unlock for App lock links the fingerprint sensor to this second layer of protection. Once enabled, a matching fingerprint replaces the password prompt for locked apps, while the password itself stays available as a backup.
To change the setting, open Settings ➔ Passwords & security ➔ Fingerprint unlock. Enter your current pattern, PIN, or password when asked, then enable or disable App lock in the fingerprint options.
Turning the option off is useful on shared devices or when you want a mandatory manual password check for sensitive apps. Turning it on speeds up daily use but relies on the same fingerprint data as your phone unlock, so anyone enrolled there also gets access to locked apps.