My project has got into a state where pressing the Draw - PolyF button has no effect, the poly edges do no become visible.
I have tried different settings for all the polyframe settings under Preferences - Draw. I have also tried twiddling the current colours and materials and making subtools visible/invisible, active/inactive.
None of it gives me the polyframes edges back. The infuriating thing is I have been here before, I’m pretty sure it’s just another zbrush gotcha, but I just cannot remember the fix.