ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMLineCallout Class / Gap Property

Gap Property (CIMLineCallout)
Gets or sets the gap (in points) between the point symbol and the beginning of the leader line.
Syntax
public double Gap {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also