Why does Zoho Quotes produce odd sized PDFs

Why does Zoho Quotes produce odd sized PDFs

When you use Zoho to generate quotes the page size in the PDFs created are 8.26 inches by 11.69 inches.  Where does this bizarre size come from and how can it changed to something sensible - like 8.5 x 11?

Right now you have to have Acrobat resize the pages to print them - which is inefficient use of page real estate dues to the strange page height chosen.