Oppo
Unlock App Lock with Fingerprint auf Oppo
App lock on Oppo phones works with a PIN or password by default, but the fingerprint sensor can unlock protected apps just as fast. The setting lives inside the biometrics menu and stays hidden until you enable it manually.
Before the fingerprint switch becomes active, ColorOS requires a privacy password. This separate password protects the App lock settings themselves, so nobody can simply disable fingerprint unlock or remove protected apps without it. If you have not set one yet, the system prompts you to create it the first time you open the App lock section.
Turn on fingerprint unlock for App lock
Open Settings ➔ Password & biometrics ➔ Fingerprint ➔ Use fingerprint for and enable App lock. Confirm with your registered fingerprint if the system asks for it.
Once active, every app you locked opens with a short touch on the sensor instead of typing the PIN each time. If the toggle stays grey, check that at least one fingerprint is already registered under Password & biometrics, since App lock cannot use a sensor with no stored fingerprint.
Fingerprint unlock speeds things up but keeps the PIN as a backup automatically, so a wet or dirty sensor never locks you out of an app.