Civil Engineering is in the College of Engineering. There’s some specific information about the requirements for changing to COE majors here, under “How do I change my major into the COE as a freshman admit?”: Advising FAQs | College of Engineering
Landscape Architecture is in the College of Ag & ES. I don’t see specific requirements listed for changing to CAES majors here, it looks like it may be straightforward as long as there is space and you are in good academic standing: The Major | College of Agricultural and Environmental Sciences
The student may also want to contact the individual departments or college advising offices to double check.