With Site Designer there are several ways to position content. But sometimes, your design might call for an item to be hidden. For example, hiding the mobile menu when the viewer is using a wide screen monitor. You could also hide unnecessary content for mobile viewers to give them a cleaner interface.
The magic Display: None property is the key to get this result. It is used to hide or show elements under specific circumstances. If you need to show the element for editing it, you can use the eye icon from the Element pane > Elements Tree to toggle the item into view.
