Posted in support forum previously. I think this is a bug.
Posted March 5
I'm using Affinity Publisher Beta v. 1.7.0.249. I started with a facing-pages spread layout, and filled it with text (100+ pages). As an experiment -- since I know of a publishing house that requires single-page spreads and doesn't want two-page spreads -- I unchecked the "facing pages" box in the Document Setup dialog. All of my text disappeared! Images are still on the pages on which I placed them, but there is no text at all.
I had saved the document, and reverted to that version, so nothing was lost, but if I need to go to a single-page format, I'll have to recreate the entire document.
Is this a bug, or a feature that is still incomplete? It should work to switch the layout once the text is placed.