Default Opportunity sort order on Account page information section.

On the Account detail page, we have Opportunity related information section.
We have multiple opportunity records on each Account. By default this section only shows 5 records and thereafter we can click on Show full list.

My question is when on the Account detail page and you see 5 records, what criteria is used to sort them by? is it created date? sales stage? revenue?

I know we can't change it, but what does OnDemand sort it by?

What is the default sorting configuration specified in the Business component (buscomp) for the Account/Opportunity child list?

thanks