Close X on a score window
If I've got more than 1 score window open, I find that it's much too easy to accidentally press the Close X button when I'm trying to switch to a different window. Could you make the X smaller, or make it so that only the current window can be closed.
Comments
Not sure why you would click anything to switch windows. Use Alt+Tab on Windows. (Mac has an equivalent key combination, but I don't know what it is.)