ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / Layer Class / LegendGroups Property

LegendGroups Property
Gets a read only collection of legend groups. Check the LegendStatus property before accessing this collection.
Syntax
Remarks
This give you access to legend patches.
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also