So this has been happening to me while I been playing games off from steam killing floor, and a bit of Garrys mod since the release of Windows blinds for windows 10.  [ I got it because windows 10 layout is an eyesore for me] At times when I go to talk to friends hitting shift+tab to open the overlay, and type in a chat. I noticed that at times, when I hit one of the following keys to typing the letter N enlarges the window making it hard for me to select anything in the resolution, F/G I believe shrinks it down to no bigger than 1 X 1 inch window. There is nothing much I can do except end the task of the program. I found nothing that works yet as a solution to help me resize to its original setting I have it at. 

At first thought I never had this happen until I put windows blinds on my PC, and considered this a feature with the program of some sorts. I tried looking into the settings and see no such setting to turn anything like this off. I have also opened games trying to replicate, and so far nothing has happened. So for me this sounds like a possible bug still in need to be fixed. 

I just want to ask has anyone else have this same issue while playing any games? Is there any fix, or trick that I can do without having to close my game completely, and reopen it?