Left side menu items not deleting
Left side menu items sticking after you've deleted the page?
When removing a link from the left side menu in Site Builder, you should delete the link first before deleting the page. If you don't, sometimes Site Builder gets stuck when deleting or adding new items in the Menus section, causing the link to stay live on your site, even though the page doesn't actually exist anymore. This results in a 404 Error message.
If a link is stuck in the left side menu, don't worry, this is easy to fix:
Go to Admin, Menus, select the folder the page that's sticking is in, and scroll down and click Change Menu Order:
Simply rearrange the menu order, then click 'Change Menu Order'
The stuck menu item should now be gone.