KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
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After an update I noticed discover was this weird yellow color, I opened settings and noticed it too was yellow, thinking it was some bug, I restarted PC, now everything is yellow. I tried inverting colors but that is something completely different. I'm not even sure what was updated to cause this.
I'm running mint 21.3 with plasma 5.27.11
This looks like one of the color blindness filters got activated. Here on Plasma 6, it's a Desktop Effect in the System Settings. Not quite sure, if that was also already the case in Plasma 5, but if you just type "blind" into the search bar of the System Settings, then it should show up and you can disable it.
No option on plasma 5 that I could find, I learned that it was a graphics driver that updated and caused all this, thankfully I had automatic backups setup.