In SF I shrink the gray photo box to better fit the page. SF's preset size leaves about half an inch cut off, so this helps with bleed and when making your pages because you're better able to know what your the printed page will look like.
Turn Advanced Editing on.
1. Choose the page you want to edit. (I just choose the page my book is open to because we're going to apply this to all pages so it doesn't matter which one you actually "edit.")
2. Click and drag the gray photo box so that the bounding box can be seen.
3. Resize similarly to how you do in PS. I resize to 11.5, which allows a tiny bit of white around the edges of the page, but I find that's preferable to losing some of my LO.
4. Center the photo box.
5. Go to PAGE > Apply to other pages. Choose Layout and click APPLY. All of your pages will have both this full-size photo sizing applied to it.
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