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Due to the limitations of Graphical Device Interface (GDI) resources per application on Windows, ArcMap does not display the legend on the Table of Contents for the ArcGIS Server service layer if it has more than 100 legend items. Therefore, it also does not display on the layout. Instructions provided describe how to display a layer that contains more than 100 legend items.
The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. ESRI cannot guarantee results from incorrect modifications while following these instructions. Therefore, use caution and proceed at your own risk.
To change the maximum legend items allowed for display in ArcMap, follow the steps below: