kxdocker : transparency not working

Configuration General Questions
1

I have such result …
membres.lycos.fr/patrick295767/k … 202006.png

I use the taviso type config .fvwm2rc slightly modified :
membres.lycos.fr/patrick295767/m … a/.fvwm2rc

My background is loaded via :

  • I Exec exec xloadimage -onroot -fullscreen ~/wallpaper

Thank you,

Greetings !!

Patrick