Where exactly can I find out how on earth to use this? No help inside the app and no obvious documents/video links here.

HI all. When I hit 'apply culling' it says faces were removed but nothing actually happens. When I load the object in my modelling software (C4D) the model is not optimized.

I'm just trying to export 2 overlapping elements. (non rotated boxes)

How do I do it? Cheers