Yes, you can preview your return before filing. Please see the below TurboTax help article for instructions.
How do I preview my TurboTax Online return before filing?
You can also revisit any section to make changes using the topic search feature in TurboTax Online. On the left-hand side go to Tax Tools>Tools >Topic Search or Topic List. Then type the section or form that you need to update in the search box and click Go.