I took the standard deduction on my state TR prior to filing. I want to revisit and see what I have to itemize and if that would be a better choice. How go back to?

If you haven't already, go back to your Federal return and enter all of your itemizable deductions there. Then complete your state return. You can delete the state return and start over if needed.

You may itemize your deductions on your Kansas Return even if you did not itemize your deductions on your federal return. Kansas instructions state that you may choose to itemize your deductions or claim the standard deduction on your Kansas return, whichever is to your advantage. This policy differs by state.

If you can itemize for your state return, TurboTax will automatically carry the deductions over to the state return and calculate itemized deductions if they are more than your standard deduction for your state.

See this TurboTax tips article for more information about standard and itemized deductions.