Dashboards can now be shared in ‘editable’ mode in addition to the previous ‘read-only’ mode. As the dashboard owner, you can elect to make the dashboard editable to users or groups that you share it with, or to make it read-only. If it is editable, users you share it with may edit the contents of your dashboard, e.g. resize widgets, add widgets, delete widgets or change widget settings.
Additionally, you can make a dashboard re-shareable, that is you give permission to people you share with to also re-share that dashboard directly with other users.
In the dashboard share dialog box, you can find checkboxes for these settings.