This feature was added a few revisions ago but until this very moment I had no idea how it was different from Align to Page.
You who are more clever than I probably figured this out long ago.
If you have set your pages to display Double Page and you align To Page, The selection is aligned to the left or the right page.
If you Align to Whole Page, the alignment applies to the combined page. In this case both alignments are centered on the page and the two pages.
But as I said, you already knew that. No?
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