This version of Unity is unsupported.
Method group is Obsolete

InteractionSource.supportsMenu

Obsolete Support for built-in VR will be removed in Unity 2020.1. Please update to the new Unity XR Plugin System. More information about the new XR Plugin System can be found at https://docs.unity3d.com/2019.3/Documentation/Manual/XR.html. public bool supportsMenu;

Description

This property returns true when the interaction source has a menu button, and false if otherwise.