How do I delete pages from the menu manager?

Go to ADMIN → Settings → Menu Manager

Once in menu agement, click on the page you would like to delete (Photo Gallery used for this example)

Once you have clicked on the page you wish to delete, go to the bottom and click "delete this menu item" 

It will ask if you are sure you wish to delete menu item, say yes, then you will receive this confirmation message 

💡Note:
Before deleting a main menu item, you must first delete the sons (submenu items)