ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMTextSymbol Class / LetterSpacing Property

LetterSpacing Property
Gets or sets the additional spacing that is added to each glyph beyond what is defined by its character box in the font. Value indicates the percentage of a glyph's width. Also known as tracking.
Syntax
public double LetterSpacing {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also