Running the latest Nvidia Control Panel and noticed the software’s options have changed. There is no Horizontal or Vertical Span option. I was able to make my laptop’s screen the primary window and then adjust the second window resolution. This seemed to be the desired output I wanted. Before this selection, the GPU simply clones the screens. Found this more confusing that the older manual settings.
To change from cloned screens to what you wanted to could also have used the Windows Control Panel > Display > Screen Resolution settings, open this by right-click in the desktop and selecting “Screen Resolution”. This window has the options for “Extend these displays” in the Multiple Displays menu which gets you custom setup on each monitor. (this is all Windows7 btw)
This Screen Resolution dialog and the Nvidia Control Panel are all you need.