Set all Qt app's to use GTK+ font & theme settings
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When using a Desktop Environment or Window Manager that doesn't allow for the settings of QT themes, you can set QT to use your GTK themes instead.
Install qt5ct
using your favorite package manager or the command:
user $ pamac install qt5ct
Set environment variables in ~/.profile
by adding or updating the following lines:
~/.profile
export QT_QPA_PLATFORMTHEME="qt5ct"
Run the application QT5 Configuration Manager from the menu or run the command qt5ct
.
Logout and login again to make the change effective