TurboTax Online doesn’t have a forms mode like TurboTax CD/Download. However, you can still see key T1 line numbers by looking at the Detailed Tax Summary. However, if you want to see line 24640, you'll need to download/print a copy of the return. This will have all the forms used in your return.
Please see the following TurboTax FAQs for instructions:
How can I see a detailed summary of my return in the online edition of TurboTax?
How do I print/save a copy of my return in TurboTax Online?
You can log in to TurboTax Online 2020 here: TurboTax Online 2020 - Sign In
