For apt version:
sed -i '/app.window/d' $HOME/.config/spotify/prefs
For Snap version:
sed -i '/app.window/d' $HOME/snap/spotify/current/.config/spotify/prefs
For apt version:
sed -i '/app.window/d' $HOME/.config/spotify/prefs
For Snap version:
sed -i '/app.window/d' $HOME/snap/spotify/current/.config/spotify/prefs