Hi,
I wanted to report back that I tested this in UE 5.3.2 and the cvars are working there.
Something important to mention is that I noticed the original post mentions that
p.Chaos.DebugDraw.Mode
was used and set to 1.
That will send the debug draw data to the visual logger instead of the viewport, which means it will not be drawn.
That cvar should be left as it is by default (set to 0), or set to 2 which will send the data to both systems if you want to see the visualization in the viewport.
If you still have issues in the last version of UE 5.3 or later versions, I recommend sharing the exact cvar combination used to see if there is any incompatibility between them.