Solution
Proceed as follows:
[1. Animal records] - [3. Sow cards] - [2. New sow cards]
Select the desired sorting order
Click 'Print preview' to see which cards will be printed
Note! If the print job is interrupted for any reason after having already been executed in Pigmanager, selecting the option above again will not print the sow cards you expect.
In that case, print the cards via 1.3.3. Period/category, for example.