Filter widgets, both visible and hidden on the dashboard, can now be edited more easily through the new 
Edit Filters option.
This option is available on the dashboard actions menu only when the dashboard already has a filter widget. By clicking this option, you will navigate directly to the filter widget’s configuration editor.
For comparison, in the past you had to use the rearrange widgets option and then navigate to the filter widget.
For details, refer to Filter Panel widget and Editing a widget.