byobu: How to force close a window?

One of the windows within my byobu session mysteriously stops receiving keystrokes. I can open new windows, but that particular window just hangs.

So now, every time I invoked byobu, I see 3 windows: 2 that I'm actually using, plus that 1 window that just sits there.

Is there a way to kill that wayward window? Preferably, just that one window. But if I need to clear the whole session, is also alright.

Ctrl-a + k kills the currently focused window after a y/n confirmation in screen/byobu.

You can use Byobu's hotkey, Ctrl-F6 to force-kill windows or panes.

Full disclosure: I am the author and maintainer of Byobu.