I am always finding that my iTunes window is too big for the laptop screen, since it usually gets resized on the big monitor. So the resize corner is off the bottom of the screen, and somehow I need to get it back.
Every other app I know lets you hit the zoom button (the green +) to get an (possibly) ideal size.
Not iTunes – you get a stupid little mini-browser if you do that. So maybe I can get the window to resize by moving the window (as in Safari)? Not a chance.
I finally had to read the Shortcut Keys in Help (if all else fails RTFM). It kindly and politely informs me that I should Option-click to get the normal behaviour.