Single combined degree(5years) with more than one concentration

I came across this on Brown’s webpage. Does nayone know if they this can be declared/selected at time of undergraduate application? Or something that a student needs to moderate and declare after admission into and after the sophomore year?

Thanks!

Brown won’t care what you declare when you are admitted. The university does not admit by major. So select history, switch to political science; select bio and switch to econ- it won’t matter.

thank you.