In 22.214.171.1242 (and likely earlier), I've noticed that the current window listed in the Window menu has a different format, with the connection info missing. I fired up 13.3 GA to verify that it has indeed changed.
Been super busy this year, so I may have missed the change. I'm not sure why (other than I'm picky and/or old), but I have to stop and verify the connection I'm on whenever I switch windows. And since I frequently have several connections opened concurrently, it's oddly jolting.
I don't suppose there's an option for that...because Toad doesn't have enough options already.