Guess no one at Microsoft realized people use computers differently and more options is always better than one. Or they intended to have the option and either forgot to include it or it was buggy. Either way it was #2 on my "how do you disable this" list, and I had to deal with it for a while. I get how grouping can be good for some things, but when you want to be able to bounce between various windows and some happen to use the same app, it was a pain.