How to lock apps for Android 10 and Android 9.0 Pie on a Mobile phone
Open the Security or Biometrics tab in the Settings app (Fingerprint, face, or password).
Find the App lock by scrolling to the bottom of the Settings screen and tapping on it.
To use App lock, you must set a private password. Then select Set Password.
The password for the app you wish to lock must be entered and established. Please re-enter the password and validate it after that.
If any security questions are prompted, answer any one of them and select the Done option.
Choose the apps you want to apply your lock to prevent unauthorised use and click on the Lock button.
Your device has now successfully installed the lock app.
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