There are different ways to aggregate point data in ArcGIS Pro. This is a good starting page that points to different resources: Visualize features through aggregation—ArcGIS Pro | Documentation There are also clustering tools like Density-based Clustering (Spatial Statistics)—ArcGIS Pro | Documentation but admittedly these won't do exactly what you're asking for... What you are looking for exactly (I think) is dynamic point clustering which is not yet available. The idea that was originally for ArcMap, is in the product plan for ArcGIS Pro and you could up vote that here Cluster Rendering for ArcMap But to get the job done today, you'll need to use one of the aggregation methods above.
... View more