What is Mark Card in Tableau?

The Marks card is a key element for visual analysis in Tableau. As you drag fields to different properties in the Marks card, you add context and detail to the marks in the view. For example, you can add multiple fields to Label, Detail, Tooltip, and Color. Size and Shape can only have one field at a time.

There is a card to the left of the view where we can drag fields and control mark properties like color, size, type, shape, detail, label, and tooltip.

The shape mark type is useful when you want to clearly see individual data points while also viewing categories associated with those points. Tableau displays your data using a shape when: The Marks card drop-down menu is set to Automatic, and you place one or more measures on both the Rows and the Columns shelves.
The Marks card is where you drag fields to control mark properties such as type, color, size, shape, and so on.

Marks Card

The Marks card is where you drag fields to control mark properties such as type, color, size, shape, and so on. The fields on the Marks card are listed at the bottom of the card. Each field has an icon next to it to identify the mark property it is setting. For example, the Marks card shown below has three fields: Customer Segment is on Color, Region is on Shape, and Container is on Size. Learn more about Marks Card, Mark Types, and Mark Properties.

After a field has been added to the Marks card, you can click the icon next to the field to change the property it is controlling. The Detail and Tooltip properties don’t display with an icon. However, you can click the white space where the icon would display to access the menu.

Many properties can have multiple fields. For example, you can add multiple fields to Label, Detail, Tooltip, and Color. Size and Shape can only have one field at a time.

By default, dragging a new field to Color, replaces the existing fields. Hold the SHIFT key on your keyboard while dragging a new field to add it to Color without replacing the existing fields.