Inconsistent global scale in KDE on 1440p monitor

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Hello and welcome,

Since everything looks fine in Live session, it means you have settings (either at user level or system wide) that are conflictual to your curent setup. In KDE Plasma you can probably remove/edit the following files:
~/.config/plasmashellrc
~/.config/plasma-org.kde.plasma.desktop-appletsrc

Example given by @dalto at some point:

  • Edit the file “plasma-org.kde.plasma.desktop-appletsrc”
  • Search the file for “SystrayContainmentId” there will be a number after the “=” sign
  • Scroll down to “[Containments][8][General]” replacing “8” with your number from the previous step
  • If iconSize is not already in that section add a line that reads “iconSize=2”. Replace 2 with your desired scale factor

Probably you could reset all the configs for KDE and start over. Here is what for instance @xircon used to recommend:
Reset and backup plasma

cd /home/<your-username>/.config
mkdir plasma-old
mv *rc plasma-old/
mv kdeglobals plasma-old/

If you have an Nvidia GPU, then you can check the /etc/X11/mhwd.d/nvidia.conf file and eventually create a new config via Nvidia X Server settings.

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