The advance child tax credit payments are here and will start arriving in July.
If you wish to unenroll from these payments go to www.irs.gov and click on the link that says "Answers to Advance Child Tax Credit Payments". From there click the link that says "unenroll" or go directly at: https://www.irs.gov/credits-deductions/child-tax-credit-update-portal

Note: If you file married filing jointly BOTH spouses must unenroll