To view and test your current keyboard layout, if you only have one layout:
Run this to show and test the keyboard layout
In case you have more then one layouts enable, which can be done with up to max 4 layouts:
you can see the other layouts with changing number
If you want to show a layout, which is not enabled but can be viewed with
e.g like this in German layout:
The tool gkbd-keyboard-display comes with the package gkbd-capplet.
To install run
HTH