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If you have the Navigation Toolbar but the button is missing, you can restore the default layout using the Customize feature. If you don't have any menus or toolbars, try the F11 key, which switches between full screen and normal views.
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
If you have the Navigation Toolbar but the button is missing, you can restore the default layout using the Customize feature. If you don't have any menus or toolbars, try the F11 key, which switches between full screen and normal views.