In the acceptance page they had a FAQ section and this is taken directly from that:
| The portal says that I'm admitted but doesn't mention anything about my major. Was I accepted into my major? |
In most cases, students are admitted to the university with a "proposed major" and later petition the department to officially declare the major after completing course work within the discipline. Transfer students in the art major and any of the engineering majors are exceptions. Please see admissions.ucsc.edu/majors and advising.ucsc.edu/roadmap/premajors for more information about your proposed major.
I should add that on the portal, if you go Main Menu > Update Major, it should say what your "proposed major" is. Mine reads:
| Major: Proposed Sociology