While not commonly used, full-screen mode can be useful on complex IDA layouts when working with a single monitor or on a laptop, for example when you need to read a long listing line but are tired of scrolling around.
The feature is somewhat hidden, but the action is present in the View menu.
By pressing F11, the current view is temporarily expanded to full screen, and all other views and UI elements (toolbars, menus) are hidden to remove all distractions.
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To go back to the standard layout, just press F11 again.