You can make changes to depreciation methods and years if you use the desktop/download TurboTax product. You do that by accessing the asset entry worksheet by using the Forms mode. You can purchase the download product and then download your tax file so you don't have to re-enter the information you have entered using the online TurboTax product.
You will see an option for that by using the Tax Tools option on your left menu bar, and then Tools and then Save your 2021 tax return to your computer.
Here is a link to where to purchase the download TurboTax products:
TurboTax download products
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