Steps
- Open Settings > General Settings.
- Turn on Enable App Protection.
- Confirm with your fingerprint, face, or your phone's PIN, pattern or password.
How it works
Next time you open the app, it asks you to Authenticate to continue. If you fail, the app closes for your security.
If it isn't available
- Biometric authentication is not available: your phone doesn't support it.
- No fingerprint or face authentication is set up: add one in Android Settings, or use your device PIN, pattern or password.