city.exr, courtyard.exr, forest.exr, interior.exr, night.exr, studio.exr, sunrise.exr, sunset.exr are shipped with Blender 2.92 and courtyard.exr wants to load by default into a simple refraction construct--it's visible here in the area below the UV skydome I set on top of the XY plane:
Before I discovered these samples in the Shading top-screen tab, I think I encountered the list of same .exr names elsewhere in the side screen control panels (but I don't remember where).
Therefore my question is where are these .exr files in Properties dropdowns and elsewhere in Blender?
.../2.92/datafiles/studiolights/world
. You can add them as any image or environment texture. Also, you said you're already aware of the selection that appears when you click the sphere in the top right (under where it says "scene world"), correct? $\endgroup$