ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMMap Class / DefaultExtent Property
Version

DefaultExtent Property
Gets or sets the extent shown when you open new views of the map. The application automatically updates this property whenever you save a project with an active map view.
Syntax
public Envelope DefaultExtent {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also