In the current version of the manual on the uF Resource page, Product version: 4.0.1 Revision date: 26 October 2021, there is no longer any mention of this function.
The manual you link to is Product version: 1.1.2 Revision date: 20 May 2019 which wrongly mention this - not sure where that is found now (it's archived on the Arturia site if you have a direct link)
In any case, there is no such function in the current firmware.