Using the XML/JSON file source and viewing the data elements in the source window, the field names, when very long, get cut off with a '...'. Since our company deals with the governement, they love to use verrrry long field names. The only way to see the entire field name is to hover the mouse over the field. Even if the source window is widened, the field names get truncated with a '...'. This is sort of a pain as these files can contain dozens of fields. I have attached a screen-snap to illustrate the issue.
Viewing the data elements in the source window get cut off