First go to the "Opportunities" tab.
Click On More Info Icon
When you wish to add more useful info to your cards, click this More Info Icon and a submenu will drop down.
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Select The Items You'd Like To See
In this submenu, you can choose any of the items listed, as well as turn them on & off.
Select The Items You'd Like To Remove
If it is already shown and you wish to turn it off, simply click the item again and it will stop showing.