The side panel is a reserved area along the side of your dashboard that you can use to give your dashboard more context, provide additional information to users, and more. The side panel is also used in interactive dashboards to host one or more selectors. A dashboard can only have one side panel that is designed to fit the entire height of your dashboard. By default, the side panel is a fixed size and position along the dashboard's edge. You can configure the side panel to be retractable by enabling the Slide over panel toggle button.