Aha! I would have
never thought to right click on the title. That worked. Thanks!
As to the Remove icon... is it on the OS X version? I just don't see it... Oh geez... I didn't see that there are grey arrows indicating more icons "off screen" that I could scroll to. DOH!
Not sure why Calibre wouldn't just open up wide enough to show all of them, there was only that one that didn't fit. And of course it was the one I needed!