The Diagnostic Navigator is a tool to help you examine potential problem areas that have been identified with the Mesh Diagnostic tools. The Diagnostic Navigator is only visible after a part has been scanned and defects in the mesh have been found.
When you activate a Mesh Diagnostic tool, it opens in the Tools tab of the Study Pane.
To activate, click the Show button and the Diagnostic Navigator
Midplane and Dual Domain parts
When you activate a Mesh Diagnostic tool, the Diagnostic Navigatorpanel appears on the ribbon, on the far right hand side. Click the arrows to move to the next area of concern.
3D parts
Select 
and the Diagnostic Navigator panel appears on the ribbon, on the far right hand side. Select a Category from the 3D Mesh Repair Wizard dialog and then click the arrows to move to the next area of concern.