"Individual Tax Return" means a tax return filed by an individual and not a business. It is not related to whether you are filing married or not.
You can rename your tax file by selecting File > Save As and entering a new name. This will create a new file.
If you imported your data, you can edit any information, but the "base" return is your 2020 return, meaning TurboTax pulled in all your info and none of your wife's.
You can start again by creating a new return using your wife's 2020 info and then adding your info. If you'd like to do this select File > New Tax Return. This will import all of your wife's 2020 info but none of your own.
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