I would say it should just work but there are a couple of required controls to juggle the shading rate and the memory usage.
The defaults are:
r.HeterogeneousVolumes.FrustumGrid.ShadingRate 4 r.HeterogeneousVolumes.FrustumGrid.MaxBottomLevelMemoryInMegabytes 128
Lowering the shading rate takes the HV voxels closer to the size of a pixel (1), but each halving of the shading rate incurs a 4X increase in voxel density and required memory. If you haven’t allocated enough memory, the volume builder just drops the voxels [the result being that dropped voxels simply disappear].