Interspire Product Knowledge Base

1) Open SideProductRecentlyViewed.php located at: /includes/display/

2) Look for the following line:
$viewed_products = array_reverse($viewed_products);

3) Directly below this line place:
$viewed_products = array_slice($viewed_products,0,1)

That will reduce the number of products shown in the box to 1. 

Likewise:
$viewed_products = array_slice($viewed_products,0,2)
would reduce the number of products shown to 2.