Thanks for the question! You can select to NOT show a page in your navigation if you'd like. So while it doesn't actually make the page invisible (someone could still get there via the direct link), it would no longer show in the overall website navigation.
When editing your website, go to "Pages" on the right side and then "Page Settings" for the page you want to 'hide'. Toggle the "Show in Navigation" to OFF and you'll be all set.