Styles > Layout
<PubML>™ eBooks offer custom page proportions that emulate the layout of printed books. <PubML>™ eBooks scale to fill the screen so page proportions are more important than fixed measurements.
Choose a standard book size or select the "custom" buttons to enter your own proportions or margins.
You can think of proportions in "inches." If your print book would be 5 x 7 inches, use 5:7 for your layout proportions.
Remember to click "Save Information" after making adjustments!