ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping.Voxel Namespace / SectionDefinition Class / Layer Property
Example Version

Layer Property (SectionDefinition)
Gets the voxel layer with which the section is associated.
Syntax
public VoxelLayer Layer {get;}
Example
Get Voxel Layer for the Selected Section in TOC
//var voxelLayer = ... ;
//Must be on the QueuedTask.Run()

VoxelLayer voxelLayer = null;
var section = MapView.Active?.GetSelectedSections()?.FirstOrDefault();
if (section != null)
{
    voxelLayer = section.Layer;
    //TODO - use the layer
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also