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

LetterWidth Property
Gets or sets the width that is added to each glyph beyond what is defined by its character box in its font. This is a percentage of the original glyph.
Syntax
public double LetterWidth {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also