The last entry in https://trac.videolan.org/vlc/ticket/824#no1 states that it is possible to display two different subtitle languages simultaneously in VLC 4.0. It provides a link to the relevant change (de9ec19c483) but that link is broken. I've downloaded VLC 4.0 and I can't see how to use this new feature. Can anyone explain it or point me to the correct link.
From the ticket
"This was addressed for VLC 4.0 as documented in de9ec19c483."