ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Editing Namespace / AnnotationProperties Class / WordSpacing Property

WordSpacing Property (AnnotationProperties)
Gets and sets the additional spacing that is added between the words of the text string. 100% indicates that regular spacing is used.
Syntax
public Nullable<double> WordSpacing {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.2 or higher.
See Also