How do I edit the amount on line 18 of 1040x? Its showing that I received a refund from the IRS that due to an error I will not be getting.

IRS has sent me a CP23 but it didn't include an amendment I need to make for QBI. Turbotax is now allowing me to zero out the refund that I won't be getting. Instead of owing $587, its showing $4614 (which includes the refund amount).