What program can automatically footnote different number of footnotes per line?
Oxford University Press (OUP) publishes the following books, and couldn't have used Microsoft Word to variate the number of footnotes per line, because harrymc affirmed
I have done some tests on Word 2019, and it seems that the option of "Footnote layout" is now dead and non-functional. [. . .] Your only option is to file a bug-report to Microsoft using the Feedback Hub, then wait for a fix.
So what programs might've OUP used? I emailed them, but they're on summer vacation. The first screenshot is fromCriminal Law: Text, Cases, and Materials (8 edn, 2018). p 180.
Same with Anson's Law of Contract (31 edn 2020) p 180.