Knuckles : how to configure deflection to activate the emulated clicking?

Hi guys, I am trying to activate this feature, but it seems I am doing something wrong.

"Valve has updated the default Index controller input bindings such that when a thumbstick is fully deflected in any direction, it is considered to be fully clicked.

Users can manually enable this new setting for any app using the SteamVR input system’s Controller Settings panel. The exact deflection to activate the emulated clicking is fully configurable."

Could you please guide me through the setup to enable it ?