Generate Corporate Background that does not influence the scene? #4-27.2

Hi, I’m new to Unreal but have about 20 years of 3D experience.
I want to make a product presentation or booth presentation where the customer can move freely and create the background accordingly in the corporate look. But now the sky etc influences the complete scene. How do I get this to be colored accordingly without distorting reflections etc.?

I know this from 3D Programs but don’t know where to push the button here :confused:

Many thanks :slight_smile:

4-27.2