How to add the blank background for car previews on custom presets

I have seen alot of mods use it aswell and i like it expecially because it blends in with the original car config preview backgrounds. my question is how do i add it when creating a custom config. is there a spesific map to do it or a option to enable it?

 

Do you mean the "Showroom"? This can be accessed by clicking on "show additional debug content" (or some similar wording) then you should see the Showroom map. When you open this, you even have a thumbnail generator that should open automatically.

 

got it, thanks