ArcGIS Online provides the ability to enable pop-ups in 3D web scenes, but there is no way to configure the pop-ups. For example, it is not possible to change the field alias name displayed in the pop-ups. However, ArcGIS Pro provides a method for editing the field alias name in the layer data source before creating a layer package and publishing it to ArcGIS Online as a hosted scene layer.
The instructions provided describe how to edit the field alias name displayed in the ArcGIS Online web scene pop-up.
Note: The changes made directly in the attribute table to the field alias name are not reflected in the layer data source.