I'm using a countywide LAS Dataset in an ArcGIS Pro 1.3 local scene and have found the Point Thinning options on the Appearance tab greyed out. I'm able to symbolize the layer and filter points, but I'd like to control the number of points drawn. Could it be related to the layer's caching? The LAS Dataset is to keep the cache between sessions (default, I think). Any help is appreciated.