To delete categories from Media tabs in your Clip Gallery

1. Select the Media tab from which you want to delete a category icon.
2. On the toolbar, click the All Categories button:

   

3. Select the category you wish to delete using the right mouse button (right-click) and click Delete Category.
4. Click OK.

Note Deleting the category will remove a category icon from the Categories page on that tab, but will not delete the clips that are in that category.