The settings you gave are for the Windows 10 built in snapping feature. I'm perfectly happy with that. What I want to disable is the Dell addin that was pre-installed in Windows 10 on my brand new XPS 15 9550 (delivered yesterday). I've shown in red on the photo the control I'm referring to. It is not part of the default Windows 10 controls. By the colour of the icons I assume it's a Dell addin of some sort. It is the most awful thing I've ever come across. I really need to disable it. I deliberately buy Dell because they don't install any useless addins and crapware, but this totally spoils they whole experience. It appears whenever you try and move a window by dragging the title bar.