ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / MultipleLabelLegendClass Class / LabelPositions Property

LabelPositions Property
Get the positions of the labels from the top in relation to the associated patch for the symbol. The top of the patch would be 0.0, the bottom of the patch would be 1.0.
Syntax
public List<double> LabelPositions {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.5 or higher.
See Also