You must have entered something else that requires you to upgrade. You can enter interest income in the Free edition as long as the amount is under $1,500 without upgrading to Deluxe. If the interest amount received is $1,500 or more then a Schedule B is require which is not supported by the Free edition.
Clear your return and start over.
If you have not paid for the online edition you are using, have not filed your tax return or registered the Free edition, then you can clear your return and start over with a lower priced edition. Click on Tax Tools on the left side of the program screen while working on the 2021 online tax return. Click on Clear & Start Over.
