FL state and local sales taxes deduction

This is my first year filing as a FL resident.  I see that the deduction is not applicable to me since I’m taking the standard deduction.  However, I do need to enter the tax rate and TurboTax generates a number, which I don't understand how it is calculated and if it matters.  Also, for the "locality" question, do I check "all cities"?  (Schedule A, line 5)