What this tile shows
Squizzie calls this one Search mode split. It is a small table rather than a single figure, so it carries a few rows of detail on the tile itself.
Where the number comes from
Fetchie Search. What visitors searched for, how often, and what found nothing.
What you need for it to appear
Nothing beyond Squizzie and the shop data it already reads.
The fuller picture
This is one figure out of a bigger subject. Search reporting in Squizzie covers it properly.