JabRef 5.x requires Java 13 (It is included in the native builds)
JabRef requires Java 8
java -Dglass.gtk.uiScale=1.5 -jar <application>.jar. If you have installed JabRef via a package manager, you probably don't have a
.jarfile but a binary file. In this case, you need to find your
JabRef.cfgin your installation folder (possibly located at
/opt/JabRef/lib/app/JabRef.cfg) and add in the section
-Dglass.gtk.uiScale=1.5. Then, restart JabRef. Try finding a value that is suitable for you. On high resolution displays, values around
1.5seem to be reasonable.