Basic Outdoor-Light-Settings (5-0EA)

Hey Guys, I am playing with some basic Light-Settings for an Outdoor lighting, but already at the very beginning I have a problem. All the time I change my “Sun” (directional light), it still looks like the post process volume has the default auto metering mode settings although I changed it. In the following video you can see my problem and my current set settings.
My aim is, when I lower the sun completly, it shall be pitch black immediatly.

UnrealEngine5 - Example for Q&A - Outdoor Light Setting