unless you unenroll you will receive the credits based on your 2020 return. you may have to repay some of the excess credits when you file your 2021 return.
you can unenroll at this website
https://www.irs.gov/credits-deductions/child-tax-credit-update-portal
see this link for info on who may need to repay
https://www.cnbc.com/2021/04/21/you-may-have-to-pay-back-some-of-the-new-3000-child-tax-credit.html
