Sorry -- you do not have direct access to the forms before you pay or before you file with online. You can only preview your Form 1040. Forms mode is a feature of the CD/download only.
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
Using the TurboTax online edition you are unable to view any forms or schedules in your tax return other than the Form 1040. To view/print/download the complete tax return you would have to pay the TurboTax online account fees.
To pay the TurboTax online account fees by credit card, without completing the 2021 return at this time, click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. On the next page, to pay by credit card, click Pay Now. The next screen will show a review of your Fees, click on Continue. Complete the next screen to pay by credit card and click Continue.
However, you can view your Form 1040 at any time using the online editions. Click on Tax Tools on the left side of the online program screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.