ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMReportDocument Class / LayoutDefinitions Property

LayoutDefinitions Property
Gets or sets the layout definitions referenced by supplemental pages of the report document.
Syntax
public CIMDefinition[] LayoutDefinitions {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.8 or higher.
See Also