Hi

On the margins' page tick off horizontally and vertically. Probably it will show that your selected range doesn't fit on one page only.
If you then choose only vertically, the text will show on the top of the page leaving the gap only at the bottom. That's all you can do about it unless you divide the printout to several pages.

Having excel to fit a big range to one sheet, it always will result that way. It works like zooming.