Problem friendly url

Hi,
I tried to use a friendly url. The problem for me is that it just changes the file and retains the name of the application with .Php.
But now, after my test (not conclusive), I would like to erase my friendly URL. I can remove it and put blank characters but it retains a redirection towards this old URL and I do not know how to tell him that the Friendly URL no longer exists and that we come back to the initial state.

Have you ever had this kind of problem?

Thanks
Guy
v9.9.020