How to Enable Fingerprint Lock on WhatsApp on Android:
1. Tap on the three-dot menu on the top right of WhatsApp and then tap on Settings.
2. Here, tap on Accounts and then on Privacy.
3. Scroll down to find the “Fingerprint lock” option and tap on it. Now, tap on the toggle to turn it on.
4. In the next step, WhatsApp will ask you to confirm your fingerprint so touch on the fingerprint sensor of your device to confirm it. Once confirmed, you will see that there is an option to set the “Automatically Lock” time. You can choose between immediately, 1 minute, and 30 minutes.