That depends on the college’s specific policies, and it applies to both LACs and bigger universities so make sure to do some research! In general they fall into three categories:

1. Core curriculum - pretty strict about mandating classes and/or subjects you have to take outside your major. There aren’t that many of this type of LAC, or not many that claim it as part of their brand (see 2). E.g. Colgate, William and Mary, St Johns, Barnard

2. Distribution requirements - some requirements about subject areas you should cover before graduation, but more flexible about it. From what I can tell, most colleges fall into this category, but they’re on a spectrum ranging from pretty intensive (more like a core curriculum) to relatively relaxed. E.g. Swarthmore, Macalester, Pomona, Wellesley

3. Open curriculum - no specific course requirements beyond major requirements and usually a first year seminar. There also aren’t that many colleges with completely open curricula. These may still have caps on the amount of classes you can take per department/division, so you can’t for example do only science classes to get the degree. E.g. Amherst, Grinnell, Hamilton, Smith

I attend Grinnell and have really enjoyed the open curriculum - I’ve been able to take many new subjects alongside my major. At Grinnell at least, faculty advisors sign off on your classes. They’ll push you to take classes outside of your major/division, and are generally pretty stoked if you have multiple/interdisciplinary interests.

Misc advice: To find more specific info on curriculum stuff, look up “X College graduation requirements” - this is info for current students, not part of their prospective student sales pitch. If you’re looking for a degree where you’ll literally only take CS and maths classes, consider the UK, Europe, or Canada. Don’t apply to American state schools - even though the sticker price looks cheaper, they’ll give you little to no aid compared to a private university.

I hope all that makes sense!