Hey, do you have a raytracing effect running in the scene?
That debug view will only show up if the light cluster grid needs to be built, so if you don’t have raytraced GI or Reflection, you will not see the grid.
I did have ray tracing on on, but I didn’t have reflection or GI yet (that comes later on in the tutorial? I didn’t realize those two things were connected\to light clusters)
Turned on Reflections, and got what I expected! Thank you!