When working with a document in Photoshop or Photoshop Elements, there will often be pixels outside the boundaries of the document. You often don't even realize they are there.
Those pixels outside the boundaries of your document are not harmless. Even though you cannot SEE them, Photoshop still counts them as part of your document . . . and they increase your document's file size.
Here's an example:
My page (above) registered at 377.97 MB. That’s over a third of a gigabyte on my computer’s hard drive. So what can I do about it??
First, make a note of your document's file size. Then, crop the document (see below) and see the difference.
NOTE: After I cropped my page, it was 215.13 MB. Much better! And now, all those extra pixels are removed from outside the boundaries of my document.
You do not have to crop your layered scrapbook pages. It’s not wrong to keep your file sizes large. In fact, it’s also not wrong to delete your layered scrapbook pages altogether.