You have qualified for the standard deduction, so that amount will be used in the computation of tax until you've entered enough itemized deductions to exceed the standard deduction.
Meaning, the deductions will not change the meter until they are over the threshold. The standard deduction is $29,200 for a joint return and $14,600 for a single person. Once your itemized deductions are more than that, the meter will change with each additional allowable expense.
Here is an article you may find helpful: Standard Deduction vs. Itemized Deductions: Which Is Better?
