If you are referring to Forms mode, that is a only feature of desktop (CD/download) TurboTax.  Forms mode has never been available with online TurboTax software.  With online you can peek only at your Form 1040:

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.

Or if you want to print your return for review before you file it:

https://ttlc.intuit.com/community/printing/help/can-i-print-a-copy-of-my-turbotax-online-return-befo...

Do you want to switch back to the Desktop program?

You can move your Online file to the Desktop program and continue without paying for Online or needing to reenter your info.

To continue in the desktop version see this…….

https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-th...

After you get the program installed the first thing to do before you open your tax return .tax file is to update the program and install any state programs you had. Then open your file. So you first might need to start a fake return to be able to download the state program (go to FILE - NEW).

You can buy the CD/Download here,

https://turbotax.intuit.com/personal-taxes/cd-download