Where to find the source of this 'Quick Filter' button?

I did a Google site search on Opus on the 1st line of the xml (saved that as a txt file at the time)

select Google Images
site:resource.dopus.com Quick Filter after:2016-01-01

and it brought me to here

How to set up a Quick Filter menu

Modify an existing filter item, Select the filter item, r-click edit.

Matter solved.