What should my son enter for Room and Board under educational expenses if a scholarship provided the room and board and he also had a small gain on a 529 withdrawal?

I'm helping my son with his taxes. He received a full scholarship from the university which covered tuition and required fees, housing, and a meal plan, and we understand the non-qualified portion is taxable. He also had a custodial 529 plan that he withdrew last year and had a small gain from the liquidation.

1. Under the "Enter Your Education Expenses" section, it is prompting for Room and Board. If we enter a value here, it seems to be taking some kind of deduction (reducing tax due). But we understand that room and board is generally not deductible. Should we enter his room and board expenses here, even though the university provided them via the scholarship? What is TurboTax doing with the amount entered?
2. Do the room and board expenses he incurred, even though provided by the scholarship, offset the small gain from the custodial 529 withdrawal? If so, where do we enter them to get this?

Thank you.