On every page and/or in any scene you can switch to the mobile editor. This lets you arrange content in a way that is more suitable for mobile devices. Unfortunately due to the free positioning of elements, we are unable to determine where elements should be positioned in a mobile version.
To help you create this version of a page however, we have put every element you used in the desktop version in an extra Element Library panel. You can drag elements from this panel to the canvas, after which they turn grey. This is done to indicate that the group/layer is used in both the desktop and mobile versions of your page.