Okay, so not sure if I can describe it correctly: Some PDFs are in a format that does not fit Zinnias Format so the entire page is small, theres a lot of empty space around it. But if you try to make it bigger via zoom, unless you zoom in completely, it just snaps back do 'default' size. Not ideal. I would like to propose that no matter how little you zoom in, the page stays that size and doesnt snap back. Or better yet, when changing the format of a pdf, stretch the entire page instead of adding white around it.