We strongly suggest that you do not make changes to any review template currently being used on programme by live learners. Changes to the review's configuration will effectively change the existing review for any learners who have completed it, and any data stored within that previous version will be lost.
The best way to make changes to a review that is already in use is to create a new review or clone an existing review, make the changes you require, and then add the review to the relevant learners.