You can choose 'Block question when returning' for different question types under 'Options'. If the respondent has clicked "next", the respondent can no longer change their answer.
For the single response question you can find it here:
You can choose 'Block question when returning' for different question types under 'Options'. If the respondent has clicked "next", the respondent can no longer change their answer.
For the single response question you can find it here: