The Duplicates component will automatically display Name and Match Confidence of duplicate records. There is an option to specify explicitly which fields you would like to be displayed in the component using Field Sets.

Note: Predefined field sets for Leads, Contacts and Accounts are included in the package.

Navigate to Setup > Object Manager and select desired object, for example Contact, hit Field Sets section and hit New button.

On the next screen, enter Field Set label, name and description.

Then drag and drop fields that you would like to be shown in the Verify component and hit Save button. 

Navigate back to the Lightning Page Builder, select DataGroomr Duplicates component and selected desired Field Set in the Display Additional Fields field. Hit Save button.

Note: You may select the same or a different Field Set for the Additional Fields Displayed in Merge Dialog property.