Change the color of the background in Player Preview window

[slashd20]

Hey. New to Realm Works, but I have worked through a lot of the tutorials I found online. Great product, but I am having trouble with one little thing, and am wondering if anyone might know a solution to it.

In the player preview (where I can send things to a second screen I have set up), all the images have a black background where there is an alpha layer (no color at all). Is there any way to change this color to a more white base color. The black makes some images hard to see (Drow, shadow demons, etc.) I attached an image of what I mean.

It may not be possible to change, but on the videos I saw, most everyone seems to have that standard cream looking color on there pictures.

Thanks.