Please add the option to show related tables in the Feature Info, Table and upcoming Edit widgets.
The ability to select visible fields would declutter the display (needed for Feature Info and Edit widgets; this can already be done in the Table widget).
Adding my voice. I need to be able to see not only the related tables, but their attachments as well! Like if I have a bridge feature service, I don't think it's too weird to want to see the related table of inspections and their attached images.