I set the 3D window settings for openGL, background as in PhotoRendering. Then I went to PhotoRendering settings, set up the background, but got no background in openGL, no matter how I set this background.
I finally realized the PhotoRendering Settings window has two competing ways of setting the background if you are using LightWorks renderings.
The settings under the LightWorks Environment tab apparently have no effect on the openGL view.
After I finally noticed the separate Background tab, and used it in addition to the LightWorks settings, I finally got something to show under openGL. However, this background tab apparently has no effect on the LightWorks Photo Rendering.
I hope that Graphisoft will make this less confusing in some future release.
R Muller AC 26 USA (20+ years on ArchiCAD) MBP 64GB Apple M1 Max OS 12.1 Monterey