Single-click selections should select all polygons at that location, not just one polygon.
This is how it currently works:
One feature is selected (the feature with the lowest ObjectID):
This is how I think it ought to work:
All features at that location are selected.
It would function similar to the select-by-rectangle tool in ArcGIS Pro, and other selection tools, which select all polygons at that location.
Related:
https://community.esri.com/t5/arcgis-pro-questions/single-click-selection-only-one-of-many/m-p/12359...