I dont even recognize what you are looking at. Is that the settings window?
That's because those are custom debug tools I've been building for the past 6 years.
I don't expect anyone to recognize the actual tool, but I am all but certain an artist at Larian will know immediately which texture this is, even if it's a bunch of debug gibberish in that screenshot.
It's a 3840x2160 BC3 compressed alpha gradient. Probably the only one in the game.