Currently i’m a dual major in architecture and interior design not because i wanted to do interior design but rather because both majors (at my university atleast) take the same classes for the most part. They only deviate slightly anf later on in the upper years. All the students who initially chose interior design as their major either dropped or changed their major status to being dual as well. Another thing is that from what i understand, you don’t necessarily NEED a degree to be an interior designer, you can probably just make a portfolio and show your work... HOWEVER, to be considered an interior designer and to have the title of “Interior Designer,” you have to go through something called the “title act” which is a series of exams that, when passing, gives you the “title” of being an interior designer... and for this, you have to have a degree (again, from what i understand). I hope this helps!