I had a few issues with this as you can only do it in career mode as I've tried quick rally but it automatically fixes your car for the next race and there's no option online, so change your settings in the main menu i.e damage heavy and the affects steering option before starting career mode do your 1st race cause damage but don't total your car then just go over the repair time limit (cheevo
) you can then change the options to whatever you prefer then continue your career 😁