for the auto screen layout, we can use the default extension available.
**but we need to customize as per our requirement.
Normally if we open the dashboard in mobile/ipad the dashboard objects look and feel will be different like all the objects will come as separate we can see one object only at a time.
coming to desktop Vs mobile.
the process what we follow:
in the same app we are maintaining separate sheets one for desktop and another for mobile version.
in desktop version normal size objects, but for mobile related sheets the objects will be some what small