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Reference
Preferences
Notebook Options
Window Properties
WindowClickSelect
• WindowClickSelect is an option for notebooks that determines if the window for the notebook should become selected if you click it.
• With the default setting WindowClickSelect 
True, clicking anywhere in the window for a notebook makes that notebook the currently selected one.
• With the setting WindowClickSelect False, a notebook does not become selected when you click in the content area of the window. This property is often used in palettes so that clicking a button in the palette does not change the currently selected notebook. Clicking on the title bar or window frame will still cause the window to become selected.
• See also: WindowFloating.
