Aperture Update book pages with master page changes
After you change a master page, the modified design can be applied to pages in your book. Aperture does not automatically update the design of pages whose master pages are modified. However, you can choose to update the pages in a book with revised master page designs.
Update a page with a changed master page design
In the Pages pane of the Book Layout Editor, select the page whose master page design you want to update.
Choose Reapply Master from the Book Action pop-up menu
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Aperture applies the current master page design to the selected page.