Here's a key board shortcut most users don't notice.

The Alt+W+Enter key combination will close the current drawing.  The sequence looks long here in text, but when you actually use it, the result is actually very fast.  Try it!

The Alt key will activate all the menu shortcuts that have a shortcut associated to them.  These shortcut letters appear with underlines.  Alt+A+Enter will start the Library Manager, Alt+F+Enter will start a new drawing, and on and on.

Try them all at least once to see if it is a more natural way to activate these default menu commands.