On the Tools ribbon, click the 
Resources graphic in the Manage group. The Resource Manager window opens.
Click the Unused tab to navigate the categories and select the unused resource you want to delete.
Click Remove.
Click Close.
You can delete unused resources within your title.
To delete a resource:
On the Tools ribbon, click the Resources graphic in the Manage group. The Resource Manager window opens.
Click the Unused tab to navigate the categories and select the unused resource you want to delete.
Click Remove.
Click Close.
The unused resource is deleted.
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