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Disable Volumetric Lightmap?

I’m troubleshooting lighting. After deleting all your lightmaps with
Force No Precomputed Lighting
and doing another bake you still have lighting contribution from your Volumetric Lightmap.

Is there a way to toggle this on and off, perhaps thru the command line?

If you remove the lightmass importance volume does that help?

That would have no effect.