Click on the Metrics Summary menu from the left hand side options of your report
Then, click on the + menu option at the bottom of your metrics page.
Then, check or uncheck any of the metrics you'd like to show or remove from the summary page of your report.
You can show as many metrics cards as you like! And don't forget you can also reorder the metrics any way you like by dragging and dropping the cards.
If you prefer to hide the summary page altogether click on the show/hide summary menu to remove this page from your report
How to hide metrics from showing through the report
You can also choose to show or hide individual metrics from the clippings in your report. Go to the Book Overview tab and click on the Metrics and Backlinks menu:
From here you can toggle on or off which metrics show through your report.