Aero Snap in Windows 7 simply moved the active window. In Windows 10 (for me now) the Windows key + arrows still move the active window but sometimes also displays thumbnails of the other windows and makes that display active. When this happens I must press other keys to get back to my originally active window.
Oh, I just figured out when the other display appears - it happens when the originally active window is moved to the half of a screen that has no window displayed on the other half. Apparently it is giving me the options available to fill that space with.
Is there a way to set the behavior to Windows 7 type?