understanding the print dialog

[Paul Scott]

From my apparently misinformed thread about Zathura print preview I 
would like to understand the print dialog that appears when I press 
Ctrl-P in Zathura particularly.

Can I somehow configure the print dialog to use Zathura for print 
preview for PDFs?

What is the reason that the print dialog converts PDFs to Cairo Graphics?

Several years ago print preview in Zathura worked quite well.

Thank you,

Paul