I want to make a classroom Duolingo for my students. I said they can use their personal Duolingo accounts, if they have one, to sign into my class. One of my students is learning French (on the side) and I am teaching Spanish. Does she need to take the French course in order for her to join my class?
She can keep the French course, and it won't cause any problems. The course you've chosen for your Duolingo Classroom is the only one that'll show up on your Duolingo for Schools page.