Are you doing 2024 in the Online version and your 2023 online return is transferring into it? Yes there is a way to clear out the 2023 data or even transfer from the 2023 return you do in the Desktop program if you finish 2023 before doing 2024.
There is a tricky way to clear out transferred info in the Online version. But doing this will also clear out all your current 2024 entries and you will have to start over. Go to Tax Tools -> Tools -> Transfer from your computer -> Continue -> then Continue without transferring.
Or you can just start a brand new account with a new username.