macOS Sierra 10.12.3 iCloud email is STILL in system preferences after signing out Story: Okay, so I have this "old" Mac which was fully signed in and connected to my Apple ID. But now that I have a newer Mac, I want fully sign out of the older Mac. So I navigate to System Preferences&gt;iCloud&gt;Sign out.

Click Sign out, wait a moment, and it says it signed out. 

Problem: However when I navigate back to iCloud in System Preferences, inside 1 of the 2 sign-in boxes is my email I use for Apple ID. 



I tried everything I could think of, but the stubborn thing just won't forget my email. And I don't like the fact that if someone were to snoop on it, they would have half of the information they need. 

Any ideas? Thanks in advance.
Well after a few hours of continuously searching for what is causing the problem, I finally found it. 

Solution: Turns out that I was still somehow connected (Not signed-in) to Game Center inside System Preferences>Internet account. After I deleted that, it finally forgot the Apple ID email.