Control Panel > Ease of Access Center > Make house easier to use > [X] Prevent windows from being automatically arranged when moved to the edge of the screen.
Computer Tips - How do I stop Windows from maximizing when I drag them?
Date: 2014mar19 OS: Windows Keywords: turn off snap on Q. How do I stop Windows from maximizing when I drag them? A. Turns out this is a (stupid) feature called "snap on".