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Reference
Preferences
Cell Options
General Properties
Selectable
• Selectable is an option for cells that determines if the window for a notebook should become selected when you click on it.
• The default setting is Selectable 
True.
• With the setting Selectable False, a notebook window does not become selected by clicking any point inside the notebook.
• Selectable only affects the selection of the contents of a window. The notebook can still be selected by clicking its title bar. The related option, WindowClickSelect, affects selection of the window as a whole.
• See also: WindowFloating.
