Open Facebook and go to your profile
Tap or click Friends
Tap or click the pencil icon or More
Select Edit privacy
Set Who can see your friends list to Only me
Save your changes
Go to Settings and privacy
Open Settings
Select Privacy Checkup
Review who can see your friends list
Set any other friend-related visibility options to Only me
On mobile, open the Facebook app
Tap the menu icon
Go to Settings & privacy
Tap Settings
Tap Privacy
Adjust friend list visibility to Only me
Check your profile from another account to confirm the friends list is hidden