I apolgozie for the ambiguity. I was referring to the WindowMargins in your case 1.
I think we first have to clarify what "Margins" means. It can be a bit ambiguous.
Do this mean WindowMargins? (http://reference.wolfram.com/language/ref/WindowMargins.html)
Or maybe you want to leave more space around the Notebook's cells with CellMargins? (http://reference.wolfram.com/language/ref/CellMargins.html)
