public class FigureSwitch : MonoBehaviour
{
    void Start()
    {

    }
    void Update()
    {
// If so, it is created with multiplication by the number of objects already created
        if (Input.GetKeyDown(KeyCode.W))
        {
            FindObjectOfType<SpawnerFigure>().Respawn();
        }
    }
}

public class SpawnerFigure : MonoBehaviour
{
    public GameObject[] groups = new GameObject[3];

    void Start()
    {
        Respawn();
    }
    void Update()
    {
  //One object is created directly
        if (Input.GetKeyDown(KeyCode.R))
        {
            Respawn();
        }
    }
    public void Respawn()
    {
        float a = 0;
        float b = 0;
        Vector3 respawn = new Vector3(a, b, 0);
        int i = Random.Range(0, groups.Length);
        Instantiate(groups[i], respawn, Quaternion.identity);
    }
}