When an app needs to showcase information in a hierarchical way, the hierarchical layout is best suited.

Example of a hierarchical layout

Structure

To organize the content of each pane, designers can use headlines. If they do so, all items from that pane most have a headline.

 

Content without headlines
Content with headlines

Behavior

Pane header titleThe header title corresponds to the selected item. 

 

New pane: When users select an item, another pane appears with items related to the selection.

Close pane: Panes do not have a close icon. Instead, they close automatically when users change the selection.