When using Show collision it appear that the collision will not update its visibility when switching between No collision and Default. Once the collision has been set to No collision it will no longer render until the level is reloaded.
Result: The visibility of the collision does not update (it remains invisible)
Expected: The collision would update and be shown when switching the collision back to Default
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-70727 in the post.