Masalah: 

GTK theme does not work properly on Qt Startup Applications

• Installed the qt5-style-plugins apt package (with all of its dependencies)
• Added a line to /etc/environment: QT_QPA_PLATFORMTHEME=gtk2 (belum dicoba bisa diabaikan?)

• Notes

  • The QT Configuration tool (shipped in qt5ct apt package) is viable but not necessary.

    • If installed it addes an X session config /etc/X11/Xsession.d/99qt5ct that sets the QT_QPA_PLATFORMTHEME to qt5ct if unset.
    • It enables a wider configuration of Qt theming. I used a minimal ~/.config/qt5ct/qt5ct.conf:

    [Appearance]
    icon_theme=Numix-Circle
    standard_dialogs=gtk2
    style=gtk2

  
  
• berlaku untuk WPS Office?