OK. So I’m really confused now. I’ve tried to do this a dozen times in the past in various documents and have not been able to do this (i.e. returning a two-column selection back to a single-column) just as the image suggests. In the past, I would have selected one or more paragraphs, changed the coumn number for that passage, but then decided that it didn’t look right, so tried to revert it back. Unable to do so, I would have to copy and paste it back as a single one.
However, in trying to get a couple of images together, I find that it works fine, and I cannot figure out how to NOT get it to work. Crazy, Eh! Let’s just hope it carries on working in the future.
However, further, how can I remove the section formatting for this paragraph, as, now, changing the columns for all the paragraphs doesn’t affect the column settings for this middle paragraph. (Say, selecting all paragraphs and changing to three-columns would leave the middle paragraph as two. See the second image.) I would have to format this paragraph to the same format as the surrounding ones. It would seem reasonable to be able to remove the ‘section’ and allow the pragraph to be in the same ‘section’ as the surrounding ones. (Not sure if I have made that clear.)