You do not have access to the forms with online TurboTax. Forms modes is a feature of desktop download software. With online you can preview your Form 1040, and when you have completed your return you can pay your fees and print or see all of the forms and schedules before you file.
PREVIEW 1040
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-return-filing/L77WCkvnu_US_en_US?uid=m681fkhr
https://ttlc.intuit.com/community/printing/help/can-i-print-a-copy-of-my-turbotax-online-return-before-i-file-it/00/26244