As I learned from a previous Feedback post I created, that several functions have to be changed in order to get 100% darkness which isn't very intuitive and doesn't make sense if you only want to make your scene completely void of light.

current solution: Change Ambient light to black, 0 IBL strength, scene lights set to 0, disable active image in project settings.

There should be a threshold that the last remaining light triggers all light or other non light, visible sources to fade out.

Now it should be easy to see why many struggle setting up their scene lighting when they expect that turning lights off should completely make the scene completely dark. Fixing this issue will help get users quickly up to speed setting up quality scenes, otherwise what should be a simple task, settings are convoluted and redundant. -Work & learn easy, not hard.