TurboTax 2019 data has errors when comparing to TurboTax 2020 Premier data.

I have TurboTax 2020 Premier for Windows (Win10). I've noticed the 2019 tax information that was uploaded to compare to my current return has errors.  For example, the total interest is several hundred dollars higher than is indicated on last years return and when TT2020 asks me to enter the capital losses carryover, the amount that comes up as a loss is actually a positive number on my 1040 from last year (line 16).  How can I delete the 2019 data and re-upload it without starting over from scratch?