SUMMARY STEPS TO REPRODUCE 1. Paper is set to "Letter" everywhere even in print dialog. 2. Print 3. OBSERVED RESULT: Print sent by Okular as A4 so printer is looking for A4 and doesn't print EXPECTED RESULT: Print as usual as every other app on Kubuntu is printing fine and printer has no issues either. SOFTWARE/OS VERSIONS Operating System: Kubuntu 20.04 KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8 Kernel Version: 5.4.0-40-generic OS Type: 64-bit Processors: 2 × Intel® Core™2 Duo CPU P8700 @ 2.53GHz Memory: 7.5 GiB of RAM ADDITIONAL INFORMATION: Same issue already discussed here https://forums.opensuse.org/showthread.php/532281-KDE-applications-always-print-A4-paper-size
https://bugreports.qt.io/browse/QTBUG-71600 says you need Qt 5.13.0 or newer.