You can expand a BOM to view the assembly structure. For models with balloons, the assembly structure column is preceded by a per-component listing of balloons.
A thumbnail preview is available for each item in a BOM when you hover over its icon in the assembly structure column. If a component's preview does not appear when you hover over its icon, open and save the component, then hover over the icon again.
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| Unexpanded BOM |
Expanded BOM showing assembly structure and thumbnail preview |