If you are one of those internet users who would like to lock their Facebook profile, then this guide will teach you how to do this on your mobile app or desktop.

Locking your Facebook profile is a security measure which is taken to protect your privacy by limiting what certain types of individuals can see on your profile. This means you can decide to hide certain attributes from people who are not on your Facebook friend list.

A locked profile will make all the photos and posts on the timeline, profile picture and cover photo, stories, and new posts visible only to people who are in the friends list, thereby making all "public" posts only visible to friends.

HOW TO LOCK YOUR FACEBOOK PROFILE USING A MOBILE APP
To lock your Facebook profile via mobile app, you will need an Android phone. Follow the steps below to get started:

First, Open the Facebook app on your Android phone and tap on your profile.

Now, tap on the three-dot menu icon next to ‘Add to Story'...
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Source:
https://www.hownaija.com.ng/2021/11/how-to-lock-facebook-profile-on-mobile-app-or-desktop.html