If you like working with the cleanest view possible, Google Docs makes it easy for you. First select View > Full screen. This will remove all menus from the screen, so make sure you don’t need to access any buttons while using this view. Now you can make your browser itself full screen. In most browsers you can accomplish this by pressing F11. With these options you will see absolutely nothing but the page you are typing on.
To undo these options, press F11 again to eliminate the browser full screen, then esc to eliminate Google Doc’s full screen mode.