ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Framework Namespace / FrameworkApplication Class / SubTitle Property

SubTitle Property (FrameworkApplication)
Gets or sets the application's SubTitle.
Syntax
public static string SubTitle {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also