I am unable to manage caption for multiple coordinate systems. It shows same coordinate system for each unit type. Do you suggest any workaround?
I also noticed WKID 3857 and 4326 doesn't have much difference in measurement unit.
You can define different coordinate to be shown but if they are not WGS84 or Webmercator then you will not get the updated coordinates as you move the mouse, you will only get the updated coordinate text when you click. This is because the mouse point has to be projected and take a round trip to the server.