Setting detail band properties – PB Docs 2022

You can specify an icon for the rows in the detail band by
clicking the detail band in the DataWindow painter to display the
Properties view.

If you want to hide tree nodes in the detail band, set the
Height property to 0. The only property that is specific to the
TreeView DataWindow is located at the bottom of the Properties
view:

For more information

For reference information about TreeView DataWindow properties,
methods and events, see DataWindow Reference.