In the GUI

Double-click the node after it runs; the following is displayed:

Hints returned by node execution

Click edit selection to see more detail:

Data Quality and Attribute Importance report

Some hints show data quality and some show important attributes (and some hints show both).

To see the important attributes report only, click the box next to Show Data Quality, so that Show Data Quality is no longer checked. The following report is displayed:

Attribute Importance report

The column with the lowest rank is the most important column in predicting AFFINITY_CARD.