I do it again from scratch.
The result is same, and the principal residence of CA 540 is blank.
The page of asking to input county and "
If your address above is the same as your principal/physical residence address at the time of filing, check this box" check box does not show up in the CA turbo tax UI.
You can try it by
1 create a Fed tax return with age < 18, student and "
If someone can claim you (or your spouse/RDP) as a dependent, check the box" checked the box (yes).
2. input a W2 form
3. No any other income and deduction
4 Finish Fed Error check
5. Then start the CA tax return and go over "General Info".
(Then you could see the UI page for county input does not show up at all)
