So sorry for your loss. For the year that your spouse passed away you could file a joint tax return. But for 2024, unless you have a qualified dependent to claim, your filing status changes to Single. It is best to start a new account with a new user ID. It is too difficult to delete the embedded information from a spouse if you use the same account that was used for past joint returns.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-online/00/25596