Remove that line.
This is the default ~/.profile
taken from /etc/skel/ at installation:
export EDITOR=/fusr/bin/nano
export QT_QPA_PLATFORMTHEME="qt5ct"
export QT_AUTO_SCREEN_SCALE_FACTOR=0
export GTK2_RC_FILES="$HOME/.gtkrc-2.0"
Then you set it to kvantum from Qt5Settings.
If you want to use Kvantum only, without the qt5ct aka Qt5Settings, then only use that line:
export QT_STYLE_OVERRIDE="kvantum"
Then from Kvantum Manager you set your theme.
You can have those also in the /etc/environment file, but in that case you don’t use export
, but again, only one of them would suffice.
For QT_QPA_PLATFORMTHEME
you can use: gnome, kde, qt5ct or xcb
For QT_STYLE_OVERRIDE
is kvantum or kvantum-dark