If you are using online TurboTax, you do not have forms mode. Forms mode is a feature of the desktop download software. With online TT, all of your information must be entered via interview screens, and you cannot see the forms until you pay your fees. You can only preview Form 1040 and Schedules 1, 2, or 3.
PREVIEW 1040
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-retur...
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