The Summary preferences tab allows you to choose which items are included on the Summary screen, and the layout of the page.
The "Available Items" box shows any additional items, not currently included on the Summary page.
Below this, there are two boxes showing the information displayed on the right and left sides of your Summary screen.
You can add and remove items in each column, and rearrange the items to display your preferred order.
It’s also possible to place items in only one column to have a Summary with a single (wide) column.