Just checked my game. No sliders popped up for me and only the gamma slider found in video options.
Also, personally I dislike the idea that 2 millions+ customers of Larian should have to manually fix what Larian imo broke
i'm using HDR so maybe it's that or it's just a bug. This patch is heavy with bugs this time around in all sections, but i definitely got a pop up for calibration sliders like you have in most AAA games. Edit: i just looked in game and you are right, those same sliders are not in settings no clue why.