CustomEndingOffset Property (CIMGeometricEffectDashes)
Gets or sets where the pattern should end relative to the ending point of the geometry. Negative numbers indicate a shift to the left and positive numbers a shift to the right. This property is only applied if the LineDashEnding is set to Custom.
Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)
ArcGIS Pro version: 3.0 or higher.