In Field Maps, when I click a polygon, I get an initial slide-up display for that area showing the layer name and an area value. That area value is incorrect and appears to be system-generated, based on the poor web Mercator projection. I want to change the display to show my arcade-calculated "acres" field, which seems to be the actual correct area. How can I do this? If I can't, is there a way to disable the default system-calculated area display?
If I understand your question, my suggestion is that you generate a PopUp for that specific feature layer in FieldMaps Designer to display the desired attributes.
I hope that's helpful.