Thank you Chris B)
I thought that the WXR switch was just a Display ON or OFF filter.
Fingers crossed then for future ground mapping (see below) addition in the radar to make it ultra realistic.
Here's the real Rockwell Collins WXR-2100 radar Quick Reference Guide which explains the functions.
If you do not read it you may for example press the TFR switch and keep wondering why changes (key presses) in your side have no effect on what you see in your ND (which is what happened to me yesterday and initiated the posting of this thread :rolleyes: )