I am using ArcGIS Pro 2.4.0
Regardless of the environment and parameter settings I use, when I run the disperse markers tool on my point feature layer, the operation is "completed", and yet there is no change to the display of the points. 
Coordinate system used is the map's coordinate system. The reference scale used is the denominator of the scale in the bottom left hand corner of my map, for which I would like the points to be scaled to.
Am I missing something here?