Originally Posted by Nyssa
How or where would I find/create this filter?
Filters are "saved searches"
so type that into the search bar, the save it with the green + at the end of the bar (you can give it a name)
That name now is available in the 'Filter box at the Left. (The blank at the top of the list, is how you un-filter).
Filters/saved searches are managed in the 'Tag Browser'