We could not reproduce the permanent disappearance, but we found and closed the trap that best explains it: if the graphics resources for a new quality level failed to allocate mid-switch (which a very high level can trigger on some GPU/driver combos), the overlay was left with no resources and no retry, permanently, even across "reset everything". In the next update a failed switch automatically falls back to the previous quality, then to the default, and logs exactly what failed. Could you try Ultra again after updating and tell us if it holds? If it disappears again, Settings > Support > Report a bug will now contain the exact failure line we need.