These are really different majors. Some lump together (Soc/Psyc/Bio/Public Health as examples), but many will be inapplicable to the previous major, necessitating more time regardless of how hard it is to change. Nothing of those previously mentioned majors is applicable to urban planning or math for example. It’s a real challenge for students that are wildly undecided. I’d focus on narrowing into at least a zone.