Version: 2020.3
public void SetAsFirstSibling ();


ローカルの Transform リストで、一番最初の順番になるよう移動します。

using UnityEngine;
using System.Collections;
using UnityEngine.UI; //Required when using UI Elements.
using UnityEngine.EventSystems; // Required when using event data.

public class ExampleClass : MonoBehaviour, IPointerDownHandler { public RectTransform panelRectTransform;

//Invoked when the mouse pointer goes down on a UI element. public void OnPointerDown(PointerEventData data) { // Puts the panel to the back as it is now the first UI element to be drawn. panelRectTransform.SetAsFirstSibling(); } }