ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping.Events Namespace / OverlayControlPositionChangedEventArgs Class / XRatio Property

XRatio Property
Gets the horizontal offset of the control as a percent from 0 (left edge), to 1 (right edge).
Syntax
public double XRatio {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 3.0 or higher.
See Also