Is the major binding?

Applying for engineering. The website says you declare your major on your application, but there are 2 places for majors. So are we undeclared first year or straight into the first choice major? And how hard is it to change majors.

Every freshman is “pre-major” if they’re Arts and Sciences and their first-choice major if Engineering. However, it’s very easy to change majors (just a form) to any major except Biomedical Engineering.