Why is there no “% of avg. order” line in the Report's “Total”?

Q: Why is there no “% of avg. order” line in the Report's “Total”?

The “… of avg. order” line is the profit divided by the average order. It is shown when the Report has one core or an explicit set of cores selected (the tooltip then says how many cores); for the grand total with “All cores” there is no such line.

Report

Click a row — or a control on the picture — to read what it does.