Those settings only applies to the old, CUDA based Luoshuang's GPULightmass. For this version, just change settings in the GPU Lightmass UI panel. If you don’t know where to find it, see GPU Lightmass Global Illumination in Unreal Engine | Unreal Engine 5.7 Documentation | Epic Developer Community. Note that this community fork has fixed lots of things compared to the official version, so some limits in the doc no longer apply.