You can change the background color of each layout part:
Enter layout mode.
Click a part label (Header, body, footer, etc).
Select a white or no file color
Repeat for each layout part where you want a white background.
Ah, never occurred to me to click the part label! Selecting "none" for fill didn't work -- simply showed the default background color -- but click "Solid" and choosing white as the color did work. Thanks!
Still think FM should offer a pure white blank page as one of the template options....
"I'd like to see more printing options in layout setup where "omit part background color" would be an option to select for a layout." Hear hear.