The fullscreen-modus allows the writer to do his work without any visual distractions.
The fullscreen-modus can be started using the toolbar (More about the toolbar) or using the shortcut ⌘+⇧+F. To quit the fullscreen-modus hit the esc-key (The esc-key can be normally found in the upper-left section of the keyboard).
The appearance of the fullscreen-modus can be altered in the preferences and within the fullscreen-modus itself. To call the options within the fullscreen-modus hit the shortcut ⌘+; or the preference-button in the lower-left when running the fullscreen-modus. Following preferences can be adjusted: