Hi User,
You are seeing the Record ID# because that is showing as the default field for identifying parent records. In order to change this you would want to go into the Master Table, open up the settings, and then go into Advanced Settings. In the Advance Settings there is a header for Identifying Records, this sets the default for displaying related records. You would just need to substitute in the fields you want to use to identify the Parent Records from a reference field in a Child. You can find below a link to a video that shows where to find this option:
https://www.screencast.com/t/gxNIrvANI hope this information is helpful and thank you for your time today.