You can now save space on your dashboards with the new Collapsible widget content option in the widget configuration editor, which allows you to collapse and expand widgets on the dashboard.
The option applies to all widgets added to dashboards with grid-based layout, except for Filter widgets, Playback widgets, Tab widgets (including all of their tabs), and Action button widgets.
The expanded or collapsed state is stored in the local storage and thus the next time you open the dashboard your widget will be displayed as you last used it.
Keep in mind that if a widget is collapsed on the dashboard, it cannot be exported and for that it would have to be expanded again.
For details concerning the specific widgets, refer to Working with widgets.