I'm not sure what you mean by "having" a Schedule A. You didn't say whether you are using TurboTax Online or the CD/Download TurboTax software. If you are using the CD/Download software you can open Schedule A in forms mode, but if you are using the standard deduction Schedule A is not included in your tax return. It should not appear in the PDF of your tax return. If you are using TurboTax Online you should not see Schedule A if you are using the standard deduction.
Where exactly do you "have" Schedule A for 2018 or 2019? Is it an actual Schedule A, with the heading "Itemized Deductions"? Or is it the Tax and Interest Deduction Worksheet, which says "Schedule A" in the top left corner? That's not Schedule A.
