Placing mouse cursor over 

 - Column title

 - Area title (Ticket categories; Tag)

Will display a magnifying glass icon next to the title

Click on this glass icon; type a word and see the linked object filtered.

Example A :

I click on the title Subject, type blue, all Title containing "Blue" will be displayed and displayed with the CATEGORIES Column & Tags linked displayed

Example B :

I click on the Title "Ticket categories" and type "Car", the categories displayed on the column Categories will be filtered on the categories containing the word "Car".

Blue Car

Red Car

Black Car

etc