Are you using Deluxe? That's what is displayed by your screen name above. The Deluxe Edition you appear to be in can prepare a Form 1040, a 1040A, or 1040EZ, depending on what your situation calls for. In other words, it prepares both the "long form" and the "short form" depending on what you require.
Deluxe is 39.99 for Federal and 36.99 for State. But prices will rise after 2/28 if not paid in advance.
By "short form" are you actually asking how to switch to one of the free products? TurboTax has 2 free products.
If you don't need Deluxe
and can file a simple return using Form 1040A or 1040EZ, you can
downgrade to regular Free Edition if you haven't already paid or
registered. Here's how to downgrade:
https://ttlc.intuit.com/questions/1894467-can-i-switch-to-a-lower-priced-version-of-turbotax-online
In
addition to the regular Free Edition, TurboTax also has another free
product called the FREEDOM Edition (not to be confused with the regular
Free Edition). It has free Federal preparation AND free State
preparation. There is no efiling fee.
The Freedom Edition is
more fully-featured than the regular Free Edition. The Freedom Edition
can prepare Schedule A, C, D, E, F and enter K-1 that the Free Edition
cannot. It will prepare a Form 1040 return, or 1040A or 1040EZ.
For Freedom Edition a user needs to meet only ONE of these qualifications:
The FREEDOM Edition is located at the following site:
https://turbotax.intuit.com/taxfreedom
Here's how to switch and start over in Freedom Edition (requires new account at the Freedom website)
https://ttlc.intuit.com/questions/2026912-how-do-i-switch-to-turbotax-freedom-edition