@dcotugno 😇 the situation is as follows.
Is a Windows issues your problem and not Origin.If the new account user don't solve the problem then the only way to get a FullScreen for Your Game you have to do a reset or restore or refresh or reinstall your Windows.
Windows users regularly reinstall Windows or restore from a recovery partition to fix system problems. Windows 8 or 10 include easier-to-use “Refresh” and “Reset” options that quickly restore Windows to a fresh, factory default configuration.So I do myself when I have problems.😉
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But you’ve created your new user account and the problem you were experiencing is solved.
OK, but now you need to make it like your previous account.
The desktop wallpaper and theme are the easy parts that can be quickly tweaked, but what about program settings and all your personal files? you asked😞
When doing this from two different computers, you can use the Windows Easy Transfer tool.
But transferring these files on the same machine can be done via manual copy and paste.
NOTE please @dcotugno accept as Solution that other users can solve their problem.Thank You!