Unlock max frame rate and turn min to 120. And keep your scale resolution default to the size of your monitor. I wouldnt scale it down unless you are turning graphics up and I wouldnt turn it off Unless your fps doesn’t fall below max. If your using unlocked and off your going to want to watch to make sure the frames arent dropping below the physical refresh rate of your monitor. Something a 30 series card is needed to do for the most part. Theres really no rule of thumb but I honestly couldn’t see ultra without scaling on any size or physical refresh rate monitor even with todays newest cards. maybe the 40s series.
And, also it kind of goes without saying but with a minimum requirements graphics card like my 1050ti. Disabling HD textures and turning down all those “percentages” in the settings to 0% is almost a must. I can’t connect to most BTB without doing that and disabling the HUD stuff. theres 3 ticks.