-- KDE -- 5.9.4 (Last version)
Hello, I added this video showing what the error is, but in short, I try to organize my application menu and try to use icons for the submenu but when I click save, the system does not save and does not update the application menu that I try to customize The submenu, but I do the procedure again and restart the PC but there is no effect.

https://youtu.be/3QxRvC0HkeE