While exploring data classification methods (natural breaks, quantile, equal/defined interval, geometrical interval, manual) in the graduated color symbology, I noticed for certain distributions, that the class break values for the quantile histogram can overlap, making them unreadable.
I visited with Esri Tech Support, and they confirmed there isn't a way to zoom into the histogram with ArcGIS Pro 2.5 as we can with ArcGIS Desktop. It would be helpful to have a zoom capability to visualize the breaks at end of the distribution to better understand distributions for certain data sets. The screenshot compares the quantile histogram with natural breaks for the same dataset to explain the issue. Thank you for considering this as a potential enhancement.
This is also related to Add customability to the Symbology Histogram which is specific to setting the number of bins.