Open Facebook and go to Settings & privacy
Tap Settings
Go to Privacy Checkup
Set Who can see your future posts to Friends or Only me
Set Who can see your friend list to Only me
Set Who can look you up using your email address to Friends or Only me
Set Who can look you up using your phone number to Friends or Only me
Turn off search engine linking to your profile
Change past post audience to Friends or Only me
Review and limit profile information visibility
Set story privacy to Friends or Custom
Turn off public post comments if available
Limit who can send you friend requests
Limit who can message you
Review tagged posts before they appear on your profile
Control who can see your profile picture and cover photo
Make your followers list private if available
Remove public posts and public profile details
Check app and website permissions connected to Facebook
Use the audience selector before posting
Block or restrict unwanted people
Set profile and timeline tagging review to On