Go to www.Facebook.com and log into your Facebook account
Click or tap on your profile picture in the top right of Facebook.
Select “Settings & privacy”, then select “Settings”.
Then select “Privacy” in the left column.
Now scroll down to "How people can find and contact you"
Now you may set your privacy settings
Recommended Settings:
Who can send you friend requests? “Friends of Friends”
Who can see your friends list? “Only Me”
Who can look you up using the email address you provided? “Only Me”
Who can look you up using the phone number you provided? “Only Me”
Do you want search engines outside of Facebook to link to your profile? “No”
Screenshots of Computer View:
DEMO- Limit How People Can Find and Contact You on Facebook