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https://askubuntu.com/questions/1466149/user-specified-print-settings-in-gtk-applications-are-silently-overriden-by-syst
gnome - User-specified print settings in GTK applications are silently overriden by system printer...
UPDATE: I have since ascertained that this appears to be a GTK printing issue, after testing in multiple desktop environments (GNOME, Cinnamon, MATE, XFCE, and...
gnome userprint settingsspecifiedgtkapplications
https://gtk-rs.org/gtk4-rs/stable/latest/docs/gtk4/static.PRINT_SETTINGS_NUMBER_UP_LAYOUT.html
PRINT_SETTINGS_NUMBER_UP_LAYOUT in gtk4 - Rust
The key used by the “Print to file” printer to store the number of pages per sheet in number-up mode.
print settingsgtk4 rustnumberlayout
https://help.prusa3d.com/category/print-settings_212
Print settings | Prusa Knowledge Base
prusa knowledge baseprint settings