I'm half-heartedly trying to RTFM of 'xpra', but haven't found the 'run_scaled' script yet. If it's not too much trouble, can you please reply with the commands you use to scale an X11 program?
(I'm on Devuan Daedalus 5.0, ~= Debian Bookworm 12.0.)
(I currently use 'xzoom' to scale X11 programs, but it's a little kludgy.)
EDIT: Single quotes for all program names. Bookworm, not Bookwork.