If you are looking to hide a page from your website's menu bar:
*Note - these pages are still active and can be visited if someone has the url, but will not be displayed in the website's menu bar.
Classic Website Editor:
Go to the Website tab and click Manage
Find the page you'd like to hide from your website menu & click 'Hide' to the right of it's name
Go to the Website tab and click Builder
Select the page you'd like to hide from the Pages list at the top
Click Page settings at the top
Select No (Hide) from the Include in Site Menu options
*Note, All sub-pages created will also be hidden from the website menu bar.
You will see '(Hidden)' in brackets beside the name of the page on the 'Pages' screen.
From there, refresh your website, and the page will be hidden from your website's menu bar.