Social media is a multipurpose place. You can use it for interaction, to be aware and also to expand your business. Since it is accessible to everyone. Privacy does become a little tricky. Let’s see, how to lock Facebook profile in Android.
How to lock your Facebook profile?
• First, open the Facebook application in your phone and tap on the three dot menu on the side.
• Here you can chose the lock profile option.
• Follow the simple onscreen process.
• Then, click ok.
• Your Facebook profile is now locked without any hassle.

Source:-
https://evajones.substack.com/p/a-know-how-guide-to-lock-your-facebook?justPublished=true