Can I remove the Navigation drop down listing? If so how?

Can I remove the Navigation drop down listing? I am trying to repackage this application to give to my friends and I don't want them to be able to use the drop down option so browse through my server.

Thank you in advance.

Do you mean the visited paths history? You need to remove it manually from configuration storage.

Sorry actually what I mean is on the right windowpane the user can actually drop down and then scroll up to see all "root" directories (/ and subdirectories) I want to remove that drop down so that they are not tempted to navigate the server.

It is not possible. You need to implement the restrictions on the server side. Please read FAQ.