That situation usually only applies when the parents earn too much to get the American Opportunity Credit for education so they allow the child to get it. The student checks the box on the federal return saying someone can claim them and then checks the box saying that no one will claim them.
To claim the student on the California return:
Go to the "State Interview" page. That page says "Your 2024 taxes are ready for us to check". There is then a "General Info" area with an edit button. After a couple of screens, that one gets you to the "Do you have a dependent you didn't claim on your federal return" page.
