I recently moved from Windows 7 to Windows 10, and when I press Win+Right, the other side of the screen shows all of my other windows. This is very annoying to me !
Can I get Windows 10 to stop doing this and act more like it did in Windows 7?
go to System > Settings > Multitasking and turn "When I snap a window, show what can snap next to it" off
source: post in Microsoft community