The distinctive characteristic of this layout is that its items can expand on click. For that very purpose, there is an additional Expand option in the On Click section.
In the Description below you should select the field which should be displayed upon expanding the item.
You also have a button that appears on the expanded list item. You can customize the button label and set an Action. Apart from Open page and Open External URL options discussed above, there is a Scroll to section option that can be used to link the button to a particular section on any other page within the app.