How can I lose weight from my arms without gaining muscles?

I’m a 16 years old girl and I’m not fat at all but my arms look a little big and I want to make it skinnier.
I’m a vegan already so I know what right foods I should eat but what exercise would help so that I won’t gain muscles?
I know If I want to lose weight from my arms then I’ll have to lose weight all over my body.
So what types of exercise and how often should I do them so that my arms will be in perfect shape?