How to stop auto-populating values from query string URL to fields?



Is there any option/setting that I can turn off the function which does auto-populating the values from query string to fields?

What I actually need is…

For example the “firstname”, if the value contains any kind of brackets such as “[firstname]”, “{firstname}” or “(firstname)”, I do not want it to be populated to the filed.

I have my custom JS function but I would like to make sure it does not crash with the existing JS function by Unbounce.

Please advise.