The Expander is part of the Navigation components which the Builder supports.
- Represents a functional UI element.
- A collapsible container that when clicked, alternately expands to display, and collapses to hide its contents.
- Allows users to drag other components into its content following the Blank view layout rules.
- To add content, drag at least one layout row to the Expander and additional components to that row or to other rows that you added.