To do this, select “Start a new return” and then click the “Create a different return” button. You can then select Deluxe as the version you would like to use.
But please be aware that if you still have things like investments, rental income, capital gains/losses, or foreign income, then you will need to use Premier for 2021. Please see this TurboTax FAQ for more information: Why did I have to upgrade my TurboTax Online edition?