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The F9 key toggles the Full Screen mode on and off. With the Full Screen mode on, the Atlantis toolbars, scrollbars, document bar, status bar and rulers, all become invisible by default. To go back to the Atlantis normal working environment, simply toggle the F9 key again or press the Esc key.
Note that you can choose which components of the Atlantis interface are displayed in the Full Screen mode. Use the View tab of the Tools | Options... dialog.