Inventor has limited options for printing, here are 3 ideas:
Use Model 1:1 with Tiled Printing turned on (it at least imitates what you drew).
Set the view screen to zoom to your area, then print with option Current Window. You could play with browser or window size until you achieve the desired aspect ratio.
Change the actual sheet size to reduce and ignore all other entities. This is the worst idea, because it would only print 1 not shiftable area, and you would have to shift ALL the contents of the document instead.
Jamie Johnson : Owner / Sisu Lissom, LLC https://sisulissom.com/