Hello i did just buy this game and i want to set up singleplayer race with AI that does not allow pit stops so damaged vehicles cant be repaired but i just cant figure out how do disable pits. One way i found was to build walls to prevent AI from being able to steer there but that means they keep coming to pits every round and try again.

You can not disallow AI from pitting. You can disable mid-race pit requirement, but you cannot prevent AI from pitting.

@MicroSpecV Thanks for quick answer atleast i know to stop looking for that option from settings. Is there mod or any other creative way to achieve this?

you can take an older version of LFS where no AI makes Pitstop