Posted by Gary S on Sep 15, 2020; 7:10pm
URL: https://forum.librecad.org/Screen-resolution-on-with-4k-laptop-and-second-full-Hd-screen-problem-tp5719542p5719544.html

Another solution is documented in a support request ('Issues'): https://github.com/LibreCAD/LibreCAD/issues/1054  On a Linux command line, type:

     QT_AUTO_SCREEN_SCALE_FACTOR=1 librecad &

See issue 1054 for more details.