The drawing mode has been amended in IWB Toolbar Addon. Now while selecting one of the drawing modes in IWB Toolbar (either pen or marker), the drawings stay on a presentation page even when a pen or marker icon is disabled on a toolbar. Previously all drawings used to disappear after the drawing mode had been disabled and they showed up again only after selecting a pen or marker button once more.
More information on IWB Toolbar is available in our documentation. You may also view a short demo.