Turn on "Unlock with Fingerprint" and confirm your fingerprint. Users can choose to lock after a minute or 30 minutes.
If fingerprint lock, users must first unlock the messenger and then read the message. Incoming WhatsApp or video calls can still be received without unlocking. All you need is an additional app. With the App Lock tool for Android, you can easily protect WhatsApp and other applications on your smartphone with a PIN lock, pattern, or fingerprint.