I've seen this problem before. It manifested itself a week or so ago. It seems like a few years ago someone told me how to get rid of this issue on my own. It works fine on Chrome, but not in Firefox (which I prefer). Thanks.
Posted at 8:47PM, 22 February 2021 PST
I solved the aggravating problem by playing around on the browser controls....I used the zoom command in views and selected "actual size" and like magic, the page popped into the two column format.
Posted 2 weeks ago.