UE 4.25 Sun and Sky Actor - too bright at night. How to control ambient light?

Yes, it looks weird. For that lat/long location, the day is transitioning to night, but I’m not sure at which point in the transition your scene represents more exactly. AFAIK, a second directional light set as a sun is one way to get a moon, but there’s other steps involved. And I think that video posted above covers it, or another Unreal featured video does.