You can make configurations related to what you want to display on summary card.
For summary card of an entity, you can choose the attributes that you want from the dropdown list.
Also, under aggregate method, you can define the way you want records to be summarized. It can be either sum or average. Also, you may define display name of that attribute.
By default, it is same as attribute name. All the selected attributes are shown in the list from where it can be removed as well.