Make sure you are entering the 1099-G in the right place. Paid family medical leave is entered the same as unemployment benefits. In the Search box type 1099-g, then click the link that says "Jump to 1099-g."
On the screen where you enter the amount that you received, below where you select the state, check the box that says "Federal or state income tax was withheld on this payment." Then when you click Continue, the next screen will give you a place to enter the tax withheld in box 4.