When viewing your page on the Preview window, you see the menu bar and all of the panels. You can easily hide the panels and the menus to get an uncluttered view of your page.
1.
Click the Full Screen Mode button on the Tools panel.
Your page is centered on the screen with a black background. If you click the center button, your page is centered on the screen, but you still see the menus.
2.
Choose Window > Hide Panels.
Your page is displayed without menus or any of the panels.
3.
Choose Window > Hide Panels again to display the panels and then click the Standard Screen Mode button.
Full-screen mode is helpful when you want an uncluttered view of your page, but you'll need the menus back to continue working on your document.