Robert Scheitlin, GISP (or anyone) - I have the latest version of Enhanced Search Widget Version 1.1.0.3 installed, and have been reading thru the thread and thru the help Web AppBuilder for ArcGIS | Help - Enhanced Search widget in the help, you mention mention
If your field choice is a field that uses a domain then the domain values will automatically be displayed in a dropdown list during configuration and in the widget UI when the widget is used. The same is true for the Unique option, the widget will query the map service for unique values to populate the dropdown with in the widget.