Purpose of Project Navmesh Walking?

I meant that with enabled navmesh walking the AI can’t fall through the ground even where no navmesh has been generated, no matter what interval I set. Enabling navmesh walking has absolutely no impact for me, no difference in performance, no difference in how the AI walks, no difference at all, so I think it’s probably not enabled, although I set the bool to true. Is there any debug option I can enable to see whether navmesh walking is active or not?
And how would I disable tracing against geometry completely, is an interval of 0 disabling the tracing or setting it to trace every frame?