com.unity.services.samples.game-lobby/Assets/Scripts/UI/BackButtonUI.cs

using UnityEngine;

namespace LobbyRelaySample.UI
{
    public class BackButtonUI : MonoBehaviour
    {
        public void ToJoinMenu()
        {
            Locator.Get.Messenger.OnReceiveMessage(MessageType.ChangeGameState, GameState.JoinMenu);
        }

        public void ToMenu()
        {
            Locator.Get.Messenger.OnReceiveMessage(MessageType.ChangeGameState, GameState.Menu);
        }
    }
}