For other styles the value is maintained but not used. A value of -1 displays as many headers as will fit after taking into account the NavigationCurrentGroupAreaMinHeight setting
Note: The NavigationMaxGroupHeaders property limits the number of group headers that are displayed at the time the property is set, but does not prevent the user from resizing the NavigationSplitterBarUIElement to display more group headers. The number of group headers that can be made to be displayed via the user interface is limited only by the value of the NavigationCurrentGroupAreaMinHeight property and the height of the control.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2