Why is the 'Filed in FYI' blue icon not showing in Outlook?

Issue
For an email that has been filed in FYI, I am not seeing the blue 'Filed in FYI' category in the Inbox or Sent folder that should display above the date (refer to 'Filed in FYI' Label in Outlook).

Cause
Categories are not selected in Outlook Columns.

Solution
Make sure that Categories are selected in Columns.

1. In Microsoft Outlook Email, display the View menu.
2. Click Add Columns.
   
   
3. Check that Categories is included in the list on the right-hand side.
   If Categories is not included, add this to the columns that show.