From the manual:

 

You can also filter the result to only items that are also shown in a given grid. To do so:

I presumed this to mean that the tag search will display only items that match the tag AND are shown in the current grid.

 

But for me, it shows all tagged items from everywhere.  In fact, it works identically to "show items".

 

Could someone explain what this means and how it works?

 

Wayne