We are moving to Lightning and there are so many dashboards present in our org which have been created in classic. What I am trying to understand is there are components on the dashboard have the option to edit as the pencil icon is available, whereas in some component do not have pencil icon so that user can customize it. What's the reason behind it? Or there is any setting, I need to configure? The same dashboard in Classic, we can edit attributes for all the components in that dashboard.