No navigation on first page

I’d like to have a home page that the public can look at that has no navigation. I would create a button on that page that says “members only” and then the rest of the site would be password protected. I can’t figure out how to NOT have a navigation on the one page only. I think that the button would link to child menus, and that would make them all password protected. Is there a way to not have navigation on a page? All the help I’ve seen is more to not having a page included in the navigation.

Thank you.