Go to Facebook and log in
Click your profile picture or name
Open your profile
Click Friends
Click the three dots or privacy settings next to Friends
Select Edit privacy
Change Who can see your friends list
Choose Only me or a custom audience
Save the changes
To hide individual friend activity, go to Settings and privacy
Open Settings
Go to Privacy
Adjust who can see your posts, friend requests, and profile details
Remove or limit mutual visibility by unfriending or restricting people if needed