What does EndeavourOS (KDE) do differently to render text on desktop?

Hello @Peter77 ,
I’m afraid this will not solve your problem:

In Fedora I wrote into /etc/environment
FREETYPE_PROPERTIES="cff:no-stem-darkening=0 autofitter:no-stem-darkening=0"

I do not see the difference, though.

A sidenote: To prevent loosing some drivers during update (I read here here how to avoid it)
nano /etc/dracut.conf.d/usb-boot.conf
force_drivers+=" uas usb_storage xhci_hcd xhci_pci "
and then update