Deleting a Widget
The manage widgets screen will list all widgets in your group, as well as ones globally shared with all groups.
From left to right, each widget displays a checkbox allowing you to select multiple widgets and perform bulk actions from the “With checked items…” dropdown menu. Check the checkbox next to the widgets you wish to delete, then select “Delete” from this menu and click the “Go” button. Use the “select all” link to select all items in the list.
Source: LiveWhale Support