The layout display only shows the area within the margins. If you don’t try ridiculously extensive margins it’s not very obvious. (I have tried it with ridiculous margins, so I’m pretty sure I’m right.) & you’ll have to be sure to print at 100% instead of fitting to page, (I’m pretty sure I’ve forgotten that almost every time I’ve gone to print, or I have some other problem that I really ought to look into.) 
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