HP 815MFP - Manual (Page 92)

86 hp designjet 815mfp & scanner 4200
nesting will give equal results no matter how the files are ordered in
the print list.
tell me about previewing and the paper frame
previewing
Creating a preview is not absolutely necessary. If you know your
settings work well with the current original, then you can skip
previewing. The Preview button can be pressed at any time, and
always creates a fresh preview of the whole image while using the
currently active settings. This means that you can visually control
new settings online before pressing the Copy button and sending
output to the printer.
With a preview of the copy loaded in the scanner software, you can
adjust your primary image settings (Type of Original template
parameters) while viewing the “before and after” effects of your
changes through a split screen.