Lockdown mode is a security feature that first arrived with Android 9 that acts as a last-resort measure to keep prying eyes out of your phone. Enabling it obfuscates any incoming notifications on your lock screen and disables biometrics and Smart Lock settings, preventing anyone from forcing you to unlock your phone with your face or fingerprint.
Use Lockdown any time you need to keep your screen locked until you can enter the password or PIN to unlock the screen. It's available for all Android phones and is easy to enable.
