Sure You can go elsewhere since you have not e-filed yet (that would be recorded electronically by the IRS) nor have you mailed it in (tht isn't recorded until the IRS actually gets it in the mail.
OR....when you log into your account and look at the page that shows your 2018 file...you can click on "ADD A State" (just under the state block on the left side), and once back in you can go to the filing section and switch over to Efile and e-file what is in there now (if it's really complete)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*