Dashlets can be shown or hidden separately for each device. This helps you control the relevance of a dashboard on different devices, such as Desktop, Tablet, and Mobile. A dashboard created for Desktop may contain many dashlets, but not all of them may be useful or necessary on smaller screens. You can hide dashlets that are not needed on a device and keep only the dashlets that are relevant for that device.
When a dashlet is hidden on one device, it remains visible on the other devices unless you hide it there as well.