Suppose you have a calculation block that varies by an array. Maybe you have “Revenue by product”, and it shows five rows, one for each product. Some people like to show “Revenue” on each of those five rows, whereas others like to show it only in the top row, and in the rows below, just show the names of the products.

Openbox defaults to the first approach (show name on all rows) but you  can switch to the second by going to the “Layout” table of Openbox settings and unchecking “Show formula name on all rows”