Identify the members of your collection

Click View All in the collection Property Editor, or use the Render Setup Filter functionality in the Outliner to identify your collection members.

Select the collection, then click View All to display the View Collection Objects window that lists all collection members.

Alternatively, you can also:

Note: This option changes your selection in the Hypershade, viewport, Outliner and other editors.

Alternatively, you can use the Render Setup Filter in the Outliner to identify the members of your collection. Enable Display > Render Setup Filter from the Outliner menu, and select Inside Selected from the filter drop-down list below the Search field. Select your collection, and the Outliner is streamlined to display only your collection members. See Filter and display only render setup members in the Outliner.

Identify nodes by selecting them in the Outliner

Collection members in the node list can also be easily identified by right-clicking and choosing Select. The node is then selected in the Outliner.