OffsetAlongLine Property (CIMGeometricEffectDashes)
Gets or sets the position where the pattern should begin relative to the starting point of the geometry. It shifts the entire pattern along the line the specified distance. Negative values indicate a shift to the left and positive numbers a shift to the right. This property is only applied if LineDashEnding is set to NoConstraint or Custom.
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3 or higher.