Are you tired of seeing the records' GUID value and want to see the actual record' name?

This video shows different methods of displaying the Records' name instead.
And here is the Arcade expression used. Just make sure to replace 'RecordHasTax' relationship class name with your relationship class name. If you are using enterprise geodatabase (AKA 'SDE') make sure to use the fully qualified name (as @GordonSumerling rightfully points down below):
// Arcade expression to return the associated record name
var RecordName = First(FeatureSetByRelationshipName($feature, 'RecordHasTax', ['Name'], false));
if (!IsEmpty(RecordName)){return RecordName.name;}
return "Missing a record";