You must be using the Deluxe Edition. Either something in your return made you upgrade, or it was done by mistake. As long as you haven't yet paid, you might be able to downgrade, depending on what all is in your return.
TurboTax Free Edition can be used for a simple Form 1040 when there are no additional forms and no schedules except for Earned Income Tax Credit, Child Tax Credit and Student Loan Interest.
FAQ: Why can't I use Free Edition?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/change-service-level/upgrade-free-editio...
You can try to downgrade to Free Edition, but if there is something in your return that requires a higher edition, it will ask you to upgrade again. The following FAQ tells how to use the "Switch" method. Another option is the "Clear and start over" method, about which there is a link in the bottom of the FAQ below.
FAQ: How do I downgrade to a different Online TurboTax product?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/change-service-level/downgrade-lower-pri...
