After creation of account, by default all your privacy settings came with public. That means every one can see your profile and find your details. If you want to hide your data, you have to change your privacy settings. Here I am giving step by step procedure for how to hide friends on Facebook app. This can hide your friends list from public visibility, only you can able to see your friends list from your profile page.
Open Facebook app and then go to settings –> Account Settings.
Then navigate to Privacy Settings and then click for options.
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Navigate for “Who can see your friends lists?”, then select “Only me”. From this only you can see your friends list and it will hide friends on Facebook.