But note that of course the text cannot flow continuously through the
section break, which I would imagine is a requirement. To get that effect,
I'm afraid you'd have to use two linked half-width text boxes on the first
page, the second linked to a third (full-width) text box on the second page,
and if this is the sort of layout you need, you'd be better off working in
Publisher or some other page layout application that is designed to use text
boxes rather than continuous text flow.