I'm using 12.1.2.27 iTunes and I'm listening to The Dan Bejamin Hour podcast, which, has video. I know because I have listened to this podcast before and there are video windows pop up when I start listening and I can see Dan there.
But I have once closed it and then now it does not shows up when I play anymore.
So is there a way, a secret menu or some shortcut to bring up the video window again?