How to show the GUI of keyboard layout on XFCE? like Gmome or MATE (see the picture)
Xfce provides You with this option in
Settings => Keyboard under
Layout section. However it does not show any visualization, just a simple list.
If You want to have an icon on your panel, like in Windows, You can add xfce4-xkb-plugin widget. Here it is nicely explained: https://fitzcarraldoblog.wordpress.com/2012/12/29/selecting-different-keyboard-layouts-in-xfce/