You'll likely need to "Permit" the app to Draw Over Other Apps so it can pop up the lock screen.
One of its coolest tricks is showing a "fake" force-close error message when someone tries to open a locked app, making them think the app is just broken.
Tap the lock icon next to any app you want to protect. Quick Security Tip
Encrypt and hide photos or videos so they don't show up in your main gallery.
Many modern Android phones (like Xiaomi, Samsung, or OnePlus) actually have a in the settings. You can usually find it under Settings > Apps > App Lock or Settings > Security & Privacy . This is often more stable than using a third-party app!
It's a security tool designed to keep prying eyes away from your personal apps, photos, and messages. Key features usually include:
Some versions can take a "break-in" photo of anyone who enters the wrong password. How to Set It Up