The “Lightmaps Tab” section at the very bottom of the “Lighting Window” documentation at
Unity - Manual: Lighting Window still says:
“If you click the filename in the Lightmap Snapshot box, the Project view will show you the asset file. If you click the small pip next to the box, an object selection window will appear to let you select a different lightmap.”
There’s no longer a Lightmap Snapshot box. I think this has been the case since at least 5.3, per “Lighting Data Asset” documentation at:
For me the Lightmaps tab looks like:
Thanks!