Just like I showed you in my picture above. Simply go to the desktop, and then nothing will ever split ever again. Period, it will never happen if you are using the regular desktop.
Not true. I never use Metro apps - at all, ever - and at least once a day, if I move my mouse wrong the screen will split without me asking. I just want to turn it off. I don't want to have to resize my desktop items all the time after the unwelcome screen split.