Mac Mail Page Size
With Mac Mail open, I clicked on the green button and the page expanded to fill the screen. Now there's no menu across the top and I can't reduce the page size.
airport extreme-OTHER
Use the Esc key to get out of full screen mode.
Also you've posted in the iWeb forum which has nothing to do with your problem. Next time if it's connected with a system application most in the forum dedicated to the system you're running. Also give more information than you have, i.e. system version, app version, i.e. Mail, you're using, etc.