If as I suspect you have set 120 DPI via KDE systemsettings5, you have several alternative options. Via systemsettings5, DPI is set via xrdb's Xft.dpi, which I expect sddm is not utilizing (I don't use sddm, only kdm, kdm3 or tdm). Xft.dpi via systemsettings5 is a user-specific method. You can try other methods.
Start by including in sddm.conf: [X11] ServerArguments=-nolisten tcp -dpi 120
The two alternatives I variously use are the DisplaySize option in xorg.conf* (either /etc/X11/xorg.conf or /etc/X11/xorg.conf.d/50-monitor.conf), and a startup script in /etc/X11/xinit/xinitrc.d/ containing xrandr --dpi or xrandr --fbmm. I would be trying the xorg.conf* approach first, as it seems to take effect during Xorg initialization rather than later.
Another option to try is replacing sddm with a different DM. Thank you, I think this is a good thing to try, makes a lot of sense to me. And you say well, I did set it via KDE systemsettings5. I will first try with the sddm.conf. Will report back when in measure to try.
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