See this TurboTax support FAQ for changing from mail to e-file - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/change-mail-e-file-turbotax-online/L0zDlGPhq_US_en_US?uid=lu8qa7oc
If you printed your taxes to mail them in and went all the way through the File section, when you sign in to TurboTax Online you'll see the Way to go! You filed your 2023 taxes and you won't see a way to change to e-filing.
Keep these considerations in mind:
To switch to e-filing:
Note: If your TurboTax navigation looks different from what’s described here, learn more.