Shortcut or button to clear on-screen annotations

Currently it's a bit difficult to clear out annotations on the screen, at least on the Mac client. If you've been drawing on the screen and want to clear it you have to go to the menus at the top of the screen, which can be very slow if you're having to draw and then clear repeatedly. It would be great if there was a clear screen shortcut key or a management panel like on Windows, including a button to manage on-screen annotations.