I have a problem. I installed the newest Ubuntu and KDE (Ubuntu 16.04 and plasma 5.5.5), may I know how to change font size in the taskbar? I already tried on irc: #plasma but the answer ( "the taskbar follows system settings -> fonts -> general" ) just didn't work :(
One more thing, I know other people don't have this issue, i.e. the above solution works, it's only me, probably in the entire world, who deals with this issue. So, something, for some reason overwrites this option imho.