With OmniGraffle 4 you were effectively shrinking the objects on the canvas. You are no longer doing this. You make that quite apparent by showing the actual page breaks. It seems to have the same effect as in OmniGraffle 4 you not only have to click "Print canvas on one printer sheet" and "Auto-adjust the canvas size" (which is better than OmniGraffle 4 IMHO) but you have to turn off View->Extras->Page Breaks. This is somewhat of a three step process. If the said purpose is to synchronize everything with printing then there should be no page breaks showing don't you think? You've already specified with the first click to print to one page why are you showing page breaks.