No. The online version saves everything you do. The only thing you can do is download the .tax2019 data file and open it in the 2019 Desktop program. Then you can see the actual entries and try to take out what you changed. And you better check what transferred over to 2020 it might affect it.
If you want to do that call support and ask for 2019 program if you don't have it.
Contact Customer Service
5am-9pm Pacific Time
7 days a week
https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
