Thanks, Dave. That latter is the reason I preferred the desktop version because with the columns being under each other on the mobile means I can only check two forums/threads for new posts per scroll whereas before (judging by the 99 forums on the home page) I could see 9 per scroll.
So I will use the browser option to show desktop site since we don't still have the within site option. I tried it just now and it got me back to having the forum list and threads one per line
