Apparently we now need to use the Page tool change the entire document if we want different alignment.
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I just tried this
Set up guides on the master page to be intersecting in the center of the page.
Go to Layout>Layout Adjustment...Enable
Then resize the document - all your images should remain in then center of the page as they are locked to the guide.
But all your images would have to be dead center on each page.
this is a quick way to change the pagesize and stay centered, although the main pagesize stayes the same.
the layout will now allways stay centered.