ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMGradientStroke Class / GradientSize Property

GradientSize Property (CIMGradientStroke)
Gets or sets how much of the feature is covered by the color scheme. This is either a percentage of the total area which the color scheme spans or the number of page units from the starting point at which the gradient displays.
Syntax
public double GradientSize {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also