How Can i remove the Navigation menu called - sample page

Hi there,

I'm not quite sure what you mean without seeing the site.

But if you don't want the navigation, set it to No Navigation here:
https://docs.generatepress.com/article/navigation-location/

If this doesn't help, any chance you can link me to the site in question?

You can edit the original topic and use the private URL field.

Let me know :)