Set all Qt app's to use GTK+ font & theme settings
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.
qt5ct using your favorite package manager or the command:
pamac install qt5ct
Set environment variables in
~/.profile by adding or updating the following lines:
Run the application QT5 Configuration Manager from the menu or run the command
Logout and login again to make the change effective