How can I change the default shortcuts in Catia V5?

Hello Catia community,


I want to change the some default shortcuts from Catia V5, but it is de-activated for any change of default setting.

For instance, I want to use "F9" as measure between in part design, but it is already used from "Stretch View", and I can't remove the shortcut for "Stretch View" as below screenshot.

In this case, how can I change the default shortcuts from Catia V5?