Some sections have a setting that requires you to submit and lock your answer before moving to the next section:
If you have answers in later sections that require correct answers in your current section, you will not be able to lock this section until you get those questions correct.
If you have answers in later sections that do not require correct answers in your current section, you can lock your section at any time.
If you try to lock a section with incomplete questions, you will get a pop-up:
If you see this pop-up, we do not recommend locking the section. You should instead go back and finish these questions.
Do not submit and lock your answer until you are certain you have responded completely. Once you lock your answer, you can't edit your response.
If you lock a section accidentally, please contact your instructor and ask them to unlock it. You can send them instructions for doing this: https://help.pivotinteractives.com/en/articles/3452478-working-with-locked-sections