Is there a way to edit a class's base skill proficiency?

Creating a character for a new campaign: an urban, city-slicker Ranger who's never been out into the wilderness. Me and the DM both agreed that it makes more sense for them to be trained in Society than in Nature - I know I could just pick up Society as one of my skills, but is there any way to straight-up remove the Nature proficiency from the base Ranger class? Every time I try to set it to Untrained, it resets back to Trained.