529 Plan: Can I Go Over the Rent Allowance for COA if My Tuition Does Not Exceed Its Limit?

For example, if my overall COA estimate is $35,000, and I’m only using $12,000/year of it on tuition, could the remaining $23,000 essentially be used all on rent as long as I don’t exceed the COA? Currently having an issue that my off-campus rent will barely leave me with money for food if I go by the rent allocation under the COA.