SUMMARY After updating to Plasma 5.18.0 fonts settings does not work. Apply button is never "on" despite doing some changes. Moreover, Firefox now looks horrible (menus and interface texts, not website contents) like if it is using wrong fonts with anti-aliasing disabled. STEPS TO REPRODUCE 1. Open System Settings -> Fonts 2. Change anything OBSERVED RESULT Apply button cannot be press, and changes are not saved EXPECTED RESULT Being able to change font settings, and Firefox looking like in Plasma 5.17.x SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux (available in About System) KDE Plasma Version: 5.18.0 KDE Frameworks Version: 5.67.0 Qt Version: 5.14.1
*** This bug has been marked as a duplicate of bug 416358 ***