sometimes can remove pillarboxing, the letterboxing is still present. (edit) the generic border remover for the supermassive games works: Looking a bit into it, they don't use the usual UE4 constrainAspectRatio flags, and it looks like they resize the actual viewport based on the aspect ratio of the window, so it's not what you usually see some black bars rendered on top of a full viewport.

Gfx look great, but I have letter boxing and pillar boxing on my 21:9 monitor wtf. It stretches the image when you go to e.g. My usual fixes in my UUU for these in UE4 games don't seem to work indeed.