The map size can be zoomed in and out. To the right of the print icon is a zoom line.
You will have to try several times to get the size the way you want. We recommend moving your zoom in and out, printing to PDF instead of the printer in order to preview.
Also consider re-sizing your units or moving them closer or further apart.
It prints small so that you can keep adding (keep in mind you can only add to the right and down).