Excel - Double clicking on pivot cell brings up raw data

Hi

In a spreadsheet that I was given: when a user double clicks on a cell inside a pivot table (shown in the first image marked by the purple arrows) it adds a new sheet containing raw data in a table (shown in the second image: this seems to be the source data)

There is no VBA in the file so I have no idea how this works or where the raw data resides.

So as an example if Australia is double clicked on a new sheet is added on the source data filtered by Australia