Currently, if you click on the "back" button on the simulated toolbar of the device image in the mobile preview, the device is rotated. This is confusing: you either expect it to work as the back button (we currently have no other way to go back in the preview than using the context menu inside the iFrame) or to be disabled.

We could add a "rotate" and a "close" icon to the image in the upper left corner, if we need something visual.