ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Core Namespace / Project Class / SelectedItems Property

SelectedItems Property (Project)
Gets the items that are currently selected in the Project pane or the Project view
Syntax
public ReadOnlyObservableCollection<Item> SelectedItems {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also