I just learned that Web AppBuilder is considered deprecated, while there is still no way to deal with Relationship established in published Feature Service in Experience. Am I missing something here?
Also, I just realized that, in ArcGIS Online Map Viewer, I cannot see related records for Feature Service hosted in my ArcGIS Enterprise 10.9. Does ArcGIS Online Map Viewer only supports relationship in Feature Services hosted in ArcGIS Online? What about the Map Viewer in Enterprise if I upgrade it to 11.1?