Is there a way to visually see the turbotax screens for my already filed 2020 taxes?

Do you want to go back into the program? 

Under Some Things You Can Do (below your 2020 return statuses), click on Add State.

This will get you back in.

Thank you for your help! 

Sign into your return and click Add a State.  That will take you back to your return.  Be careful to not make aby changes as they will permanently change your return.

You have 3 years from the date you filed your return or 2 years after you paid the tax due (whichever is later) to file an amendment.