The Structure Panel is located to the far-right of the Control Columns, and provides an overview of the elements present in your project as a tree. This allows you to see how elements are nested within each other. You can also click and drag on the arrow icons to the left of the Structure Panel to reorder elements on your page.
The Structure Panel provides two ways to view your project – Basic and Advanced. The Basic view displays only Rows and Columns. The Advanced view gives a more comprehensive overview, and displays the elements which are contained within Rows and Columns.