Delete a smart brief
You can delete a smart brief when it is no longer needed. When you delete a smart brief, all the content it contains is permanently deleted. References and assets linked to the brief are not deleted.
To delete a smart brief:
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On the menu bar, click Content Ops.
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On the Content Operations page, in the left pane, click Briefs.
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Click the brief to open its details page.
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On the menu bar, click Options
> 
Delete. -
In the confirmation dialog, click Delete.
There is no recovery mechanism, so be sure you want to delete it.