State Tax form e-file change to mail

I would like to know why I cannot change my state tax form from e-file  to mail in TurboTax.

Early on, I made the mistake of clicking the box for the question to e-file my state return. I really wanted to mail it instead. I have not found any way to change this to mail. I have my son's state tax form that I really wanted to e-file instead, but now I cannot.

I really do not understand why there isn't a place in the application where I could make this change. Seems pretty simple to me, just add a check box that could be checked for e-filing the federal or state return. This box could be changed back to blank if the person has changed their mind and doesn't want to e-file. Simple solution, please let me know why this change can't be made. Thank you.