Adicionei esse codigo ao button receiver para permitir o click com o mouse

[GAMAURER]

private void Update()
{

    //PointerInputEventData pointerInputEventData = FocusManager.Instance.GetSpecificPointerEventData(pointingSource);
    //GameObject obj = pointerInputEventData.selectedObject;


    //if (Input.GetButtonDown("Fire1"))
      
    if (Input.GetMouseButtonDown(0))
    {
        Debug.Log("click");

        GameObject obj;
        RaycastHit hitInfo;
        if (Physics.Raycast(
                Camera.main.transform.position,
                Camera.main.transform.forward,
                out hitInfo,
                20.0f,
                Physics.DefaultRaycastLayers))
        {
        
            obj = hitInfo.collider.gameObject;
            obj = obj.transform.parent.gameObject;
            // If the Raycast has succeeded and hit a hologram
            // hitInfo's point represents the position being gazed at
            // hitInfo's collider GameObject represents the hologram being gazed at

            txt.text = obj.name + " : InputDown";
            Debug.Log(obj.transform.parent.name);
            if (obj.layer == 9)
            {
                // is and object -> shoudld check if correct
                if (obj.name == objectToFindName)
                {
                    Correct();
                }
                else
                {
                    Wrong();
                }
            }
            else if (obj.layer == 10)
            {
                // object from scene selector menu
                GoToNextScene();
            }
            else
            {
                // is a menu option -> should show other menu

                testManager.GetComponent<FileLog>().Click(3);

                //hide curent menu
                currentMenu.SetActive(false);

                //show next menu
                foreach (GameObject m in menus)
                {
                    if (m.name == obj.name)
                    {
                        m.SetActive(true);
                        currentMenu = m;
                        break;
                    }
                }

            }
        }
    }
}