While we are unable to stop a return that has already been filed, you will have options to make changes.  These options will depend on the status of your filed return (Pending, Rejected, or Accepted):

• Pending - Please wait for the IRS to accept or reject your return.

• Rejected - If the IRS rejects your return, you will be able to make changes to the return and then refile.

https://ttlc.intuit.com/replies/4193396

• Accepted - If the IRS accepts your return, you will need to make changes by amending your return.

https://ttlc.intuit.com/replies/3288565

https://ttlc.intuit.com/replies/4804061

So how do you amend the return?

If you need to amend your tax return for tax year 2020 or earlier, please see How to amend (change or correct) a return you've already filed for information and instructions. 

The option to amend a 2021 tax return will not be available until later in the tax season. You can check the status of Form 1040X's availability here. 

 @BillyBanks