How to change the friction coefficient and elasticity coefficient of a rectangle arena in Webots R2021a?

[gh18406468101]

I can't find the options regarding friction coefficient and elasticity coefficient. How should I change them, or can I say that this cannot be changed

[ShuffleWire]

It possible :
You have to setup contactProperties in the WorldInfo

If not changed, the material of your arena is "default"

and the name of the material2 should be the name of the object colliding it
I let you read
https://cyberbotics.com/doc/reference/contactproperties
and play with
asymmetric_frinction1 and asymmetric_frinction2 (you can find them in the sample list)