Go through the beginning interview about yourself ( and spouse ) again to change this setting.
The only way to change your dependency status on Form 1040-X is to state the new status in Part III Explanation.
i.e. " I am changing to 'no one can claim me' " or 'someone can claim me'.
Then proceed to revise your tax return accordingly.
Continue in Part III with the explanation of your changes.
@samwise252
