RH2019: Middle-click tabs to close?

Hi guys, so, stupid question.  In RH2015, RH2017 and RH2019 (Classic) I used to be able to close open topic tabs by middle-clicking them with the mouse wheel (similar to closing browser tabs).  However, that's no longer an option and I can't find a setting where I can set it.  I just tested with the Classic, and it still works just fine in Classic, but on the new UI it's gone.  I find it a bit annoying to have to finely click with the mouse on the little "X" on every open topic every time I want to close a bunch of topics (it happens quite a lot), and I was wondering if there's an easier way, or a feature I'm missing?