Changes After I Already Filed

The Child Credit increase included in the Covid relief package reduced my tax obligation. I filed early March and already paid the IRS.

 

I read on IRS website that the Child Credit increase can be applied to 2020 filing, and when I log into TT acc the 2020 TAX due for Federal is 1k less that what was due when I filed and already paid, which lead me to believe that the child credit increase is applicable for 2020. 

 

I am now trying to amend my 2020 filing so that I get refunded the 1k difference. When I try to file the amendment it also picks up State. Can I by pass the State and only amend Federal?