Facebook has updated the Facebook profile locking feature for users in Vietnam without you needing to change the country or install any other support applications. When we lock our Facebook profile page, strangers cannot see any content you post on the page and friends can only see your Facebook cover photo and profile picture. This will somewhat increase each person's privacy when using Facebook. Below are the steps to lock your Facebook profile page
Instructions for locking Facebook personal page
Step 1:
At the Facebook personal page interface, the user clicks 3 dots icon as pictured. Switch to the new interface Click on Lock to protect personal page to perform.


Step 2:
Now you will see information about how to lock your Facebook profile Click on Lock personal page protection to perform. Your Facebook page will immediately be locked to protect your personal page from being viewed by strangers.


This will now appear on your personal page notification You have locked your personal page as shown below.
Step 4:
To Unlock personal Facebook pageyou click again 3 dots icon Already select Unlock profile. Continue you Click Unlock to perform. Click Unlock personal page to unlock your Facebook page is fine.
So you have unlocked the Facebook page as before.
So when you open Facebook, your Facebook posts will be accessible to more people and strangers will also see your cover photo and Facebook avatar.