Deductions & credits

So basically, go through all steps, look up all forms and enter every bit of information, and then turbotax just decides for me whether we are itemizing or taking standard deduction? I didnt know if it came out and asked "are you itemizing your deductions?" And I honsetly didnt know what the answer would be. But for whatever reason the last 6 years we took the standard when someone else did our taxes through turbotax.  So lets say I Do enter the information for the Mortgage Interest and Property taxes but then turbotax decides I should not itemize the deductions. Does it just omit that info I entered in for the Mortgage and Real Estate Taxes paid?  And also if that is the case will it automatically plug in the standard deduction amount we are qualified for, or do I have to go back and find how to do that myself?