It depends on how you came to be in TurboTax Live.
See the FAQ below which has 2 scenarios. Choose the one for your situation to see how you would have to resolve your situation.
NOTE: If it does require you to "clear and star over", then don't do it yet. You could consider downloading your *.tax2018 data file to a desktop product (CD/download) and finishing it and filing it with the desktop software without starting over. I can tell you more if you want to move from the Online version to the desktop version.
FAQ: How do I remove TurboTax Live?
https://ttlc.intuit.com/replies/6420172