Facebook Messenger for iPhone comes with an “App lock” feature that allows you to lock the app.
You can enable this feature by following these steps:
Open the Facebook app.
Tap your profile picture in the top left.
Tap App Lock.
Enable Require Face ID.
Tap OK on the pop-up.
These options are now available to you:
- After I leave Messenger
- 1 minute after leaving
- 15 minutes after leaving
- 1 hour after leaving
Select one of the options above to set when the app will lock.
That’s all there is to it. Face ID or passcode will be required to unlock the app from now on.
Note: You can turn off the app lock at any time by disabling the “Require Face ID.”