It is possible via an internal configuration settings change, to have the ability to amend the sort order of related products within the product page, from the default 'Name' listing.
The options are:
There is an additional setting for the quantity of displayed related items when set to manual. "The Number of related products to show on product page Threshold Setting = x"
The example below has a setting of 3, the last 2 out of the 5 are highlighted with a red warning. If this isn't your desired list display then clicking on the green up/down arrow of your chosen item will allow you to move its position.
Please contact support if you like the settings changed.