ArcGIS Pro 2.9 API Reference Guide
CIMLayoutDocument Class
Members 

ArcGIS.Core.CIM Namespace : CIMLayoutDocument Class
Represents a layout document which is the document type used for saving .pagx files.
Object Model
CIMLayoutDocument ClassCIMLayoutDocument ClassCIMLayoutDocument ClassCIMLayout Class
Syntax
Inheritance Hierarchy

System.Object
   ArcGIS.Core.CIM.CIMObject
      ArcGIS.Core.CIM.CIMVersion
         ArcGIS.Core.CIM.CIMLayoutDocument

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

See Also

Reference

CIMLayoutDocument Members
ArcGIS.Core.CIM Namespace