As part of its Automatic Layout for Print, Vellum may shorten pages on both sides of a spread. Vellum does this to ensure that, after widow prevention, each page spread remains balanced – i.e., the bottoms match:
To see how this will look to readers, we recommend viewing your book as two-page spreads. To do this, open your PDF in your Mac’s Preview utility and select View ▸ Two Pages.
You can learn how to proof your Print edition in Vellum Help.
Still have questions? Contact us.