Create another layout without the navigation bar in it and use it for that page.
A best practise for this could be to have a master layout without the navigation and derive a new layout from this master layout, where you add in the navigation bar. This way you only have to update the master layout when you want to change something in the layout itself.
In the security settings we can provide the page access to the particular user so the the same user will not be able to see the navigation menu item.