If you don't have any 1099-NECs, you're not considered self-employed. You can remove them from your return by clicking on the trash can next to them or you can delete from Tax Tools.
To delete a form in TurboTax Online follow the instructions below:
Open TurboTax and your return
Select Tax Tools from the menu on the left side
Select Tools
In the pop-up window select Delete a form
Find the form 1099-NEC in the list and Select Delete.