Open Settings
Tap Security or Privacy
Look for App Lock, App Protection, or Lock Apps
Turn on the feature
Set a PIN, password, or pattern
Select the apps you want to lock
Confirm your choice
Use a third-party app locker if your phone does not have built-in app lock
Download a trusted app locker from the Play Store
Grant the required permissions
Choose the apps to protect
Set the unlock method
Enable fingerprint or face unlock if available