HOW TO FIX ERROR #9 : STARTUP APPLICATION ICONS ARE NOT SHOWN ON PANEL As you can see, my icons are shown, but if your icons in xfce4 panel aren't shown then you can do a simple step.
Type :
xfce4-panel -r
This command restarts your panel and it also works, if your Desktop is freeze. You have either to logout or you open a terminal by short keys.
Here is a short key list for Linux Desktops :
https://linuxhint.com/100_keyboard_shortcuts_linux/
Join @B0RNTOLE4RN
