I am using Export Web Map geoprocessing tool to export high quality poster sized PDF maps. We are using Geocortex to create web maps so I am not too familiar with the code side of the things with web mapping.
The map turn out to be great, but I am wondering if there is way to remove the group titles in the legend (screenshot 1). I know with ArcMap Desktop, this can be easily set up with "Legend Item Selector" setting (screenshot 2). I tried to change this setting in my mxd template used for the Exportwebmap geoprocessing tool but it doesn't seem to change anything. I am wondering if this is set up at the json file. Currently my json only contains layer id and sublayer id for the legend. I have attached my json with this question. Please take a look and let me know if this is at all possible.