Er, on my laptop? It might be more precise to say that I can't find any way to make it use anything else; manpages give me nothing, grepping for "layout" in the source tree gives me nothing (relevant;
window layouts show up), and there's an open issue (
https://gitlab.com/cardboardwm/cardboard/-/issues/30) asking for it, all of which makes me conclude that it doesn't appear to support doing anything but QWERTY. That said, I said "AFAICT" for a reason; if you can prove me wrong I'll be quite grateful (because, seriously, I would like to use this thing).