Marmoset Viewer export - disable backgrounds?

Violet

I'm using Marmoset's really cool exporter/web viewer (on Artstation)
I'm having trouble disabling backgrounds - I can't get the visibility in screen to black. It shows up maximum everytime. My scenes are looking 'washed out' and the background is undesirable, the background is set to max visibility! Does anyone know a workaround? There isn't an option in the exporter.

The thumbnail shows how I want it exported - the actual exported scene has other ideas though.

eg:

https://www.artstation.com/artwork/Z5eYEZ

EarthQuake

Go to the Sky object properties and change Backdrop Mode to Color, this will let you set the color to black.

Violet

Thanks, it worked in the viewer!

Is there anyway of getting the skycube thing to display to the same settings as the editor? It doesn't seem to replicate.