Full Screen without Menu is for performing the same job as number 3 but without any menu at the top.Fullscreen with Menu is for hiding the status bar as well as filling the screen with pasteboard.The toolbox consists of two columns and presses F-key for full screen. You can maximize the main window for getting better consequences. The new style of Photoshop is Platte Panes which is reduced into icons. The slick and intuitive UI is very appealing and easy to use. Adobe Photoshop CS3 Features Intuitive Interface