If you have a second display connected to your Mac, by default when you switch to Full Screen mode, Windows is displayed on the primary display and Mac OS X on the secondary. Set What Shows on Displays Connected to Your Mac In this Full Screen pane, you can adjust any of the settings listed below.If the Parallels Desktop menu bar is visible at the top of the screen, choose Actions > Configure, and then click Options.Click the Parallels icon in the menu bar and choose Configure > Options.You can customize how Windows appears and behaves when in Full Screen mode. Adjust Full Screen Settings Adjust Full Screen Settings