Open Facebook and log in
Go to your profile
Click Friends
Click the pencil icon or three dots on the Friends section
Select Edit privacy
Choose who can see your friends list
Select Only me to hide your friends list from others
Click Done or Save
To hide specific friend activity, go to that friend’s profile
Click Friends
Select Unfriend or Remove friend if needed
To limit who can see your posts, go to Settings and privacy
Open Privacy settings
Adjust Who can see your future posts
Adjust Who can send you friend requests
Adjust Who can look you up using your email or phone number
To hide mutual friends, set your friends list visibility to Only me