I’m not sure I completely understand the question. The values entered in their response must be present when they click Next Page, so that the values can be captured. As a convenience, when they click back to the previous page, these values are still present so they can make changes.
There is an option in our surveys to remove the ‘previous page’ button as well as a forward-only survey that also blocks them from using the browser’s back button. They are found in Look & Feel and Advanced Options, respectively. This may be what you are looking for.