On published forms, the prompt that a user sees inside the link field widget prior to clicking on the widget should be prompting the user to “Select”. Currently, it’s prompting the user to Add, which always makes me think that clicking it will create a new record within the linked table. While there may be some use cases for enabling an ADD functionality, that would be a secondary function. It’s a selector widget. It’s there for the user to select something. So, “Select” seems like a much more appropriate verb than “Add”. Maybe it could be made configurable, but if it’s going to be a fixed value, “Select” seems a much more standard prompt.