Download third-party extensions from the Mac App Store. To start a project, simply select photos, an album, a memory, or even an existing project, and then choose the extension you want to use. The gutter is the distance between your content and where you will have the fold in your booklet. Just go to the Mac App Store to learn about and download each extension.
In the Pages section, in the Multiple pages area, select Book fold.
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Click Format in the menu and then click . Organize & manage your business with the 1 rated solution.