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I'm using Ubuntu 20.04 with XFCE4 dark theme, but KDE apps (for example: ktorrent) are using default bright theme. How to set those apps globally to use dark theme?

(previously I never had this problem at all since I almost never use KDE apps)

Gnome apps (gnome-disks, gprename) themes using dark theme without any manual settings (probably respecting xfce4's settings? or their default are already dark mode)

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To changes the KDE apps theming you would need system settings from KDE systemsettings5 this will save the theme settings under ~/.kde/share/config/kdeglobals.

Otherwise as KDE is using Qt for its application the parameter --style can be used to change the theme per application as follow:

konsole --style "Adwaita"
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    i've installed systemsettings package, but after opening systemsettings5 it only have 4 configuration options: shortcuts, applications, settings (network), and kde connect; no settings for theme ibb.co/3dn1Wzw – Kokizzu Jun 6 '20 at 20:08
  • I guess some other package are missing to have the theme category – origami Jun 6 '20 at 23:17
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Nevermind, found the answer: Get Qt5 Apps To Use Native Gtk+ Style In Ubuntu Or Debian, I was searching with wrong keyword, it should be "how change qt apps theme in ubuntu"

sudo apt install qt5-style-plugins

solved the issue (you'll need to restart the KDE apps) and it would use dark theme normally.

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