Trying to create a list view to filter on workflow internal status (Started, Suspended, Terminated, etc.) but workflow name, Travel Authorization Request, doesn't appear in Filter options drop-down (img below).  Workflow name is available in Columns, to add to list view, and I have added that, but that column shows the status as set by workflow actions (e.g.: "Pending Supervisor Approval", "Approved", etc.).  Tried 'Group By' but it doesn't show the workflow internal status.  

Am I missing something?  Any direction would be greatly appreciated.