Ok, I was sure I could do it here https://www.plotaroute.com/myroutes - That's the place it would be useful, not on my homepage. But thanks anyway
You can sort the My Routes page using the drop-down sort selector above the table. We haven't chnaged this at all so I think you might be confusing this page with your personal home page, where you can sort the lists of routes by clicking on the column headings.
I use to be able to sort the route lists by created date or other columns such as Distance. These days you can not sort at all.
Tried several different Web browsers and it makes no difference.