In 14.0.25.592 (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.
I did check that -- mine's set to "User@Database". If I set it to "No Connection Info", all of the items in the Window drop down lose their connection info in the description. If I set it back to "User@Database", all items again have the connection info, except the current window.
This could be just me. I'm having that kind of a year today...