Once you are satisfied with your modifications, you will have to save your rule to then be able to preview the changes under Selected Rule Preview. Note that if you are unsatisfied with your rule or made a mistake in your set up, you can return to Edit Rule to adjust at any time.
The modified attribute will be displayed under its respective column, labeled with "modified:"
All column headers are filterable using the filter icon to the right of the column name. You can adjust which columns are displayed by clicking on the three-bar icon to at the top right corner:
Additionally, you can export the entire table into a CSV file using the export icon: