Join Menu tabs retain their color on change.

Assets/Prefabs/UI/JoinCreateCanvas.prefab

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+      - m_Target: {fileID: 4578721078997909056}
+        m_TargetAssemblyTypeName: LobbyRelaySample.UI.JoinCreateLobbyUI, LobbyRelaySample
+        m_MethodName: SetCreateTab
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+        m_TargetAssemblyTypeName: LobbyRelaySample.UI.JoinCreateLobbyUI, LobbyRelaySample
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+  - component: {fileID: 6102798993520257211}
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Assets/Scripts/UI/CreateMenuUI.cs

     /// </summary>
     public class CreateMenuUI : UIPanelBase
     {
-        private LocalLobby.LobbyData m_ServerRequestData = new LocalLobby.LobbyData{ LobbyName = "New Lobby", MaxPlayerCount = 4 };
+        public JoinCreateLobbyUI m_JoinCreateLobbyUI;
+        private LocalLobby.LobbyData m_ServerRequestData = new LocalLobby.LobbyData { LobbyName = "New Lobby", MaxPlayerCount = 4 };
-            Hide();
+            m_JoinCreateLobbyUI.m_OnTabChanged.AddListener(OnTabChanged);
+
+        void OnTabChanged(JoinCreateTabs tabState)
+        {
+            if (tabState == JoinCreateTabs.Create)
+            {
+                Show();
+            }
+            else
+            {
+                Hide();
+            }
+        }
+
         public void SetServerName(string serverName)
         {
             m_ServerRequestData.LobbyName = serverName;

Assets/Scripts/UI/JoinCreateLobbyUI.cs

+using System;
+using UnityEngine;
+using UnityEngine.Events;
+
+    public enum JoinCreateTabs
+    {
+        Join,
+        Create
+    }
+
+        public UnityEvent<JoinCreateTabs> m_OnTabChanged;
+
+        [SerializeField] //Serialized for Visisbility in Editor
+        JoinCreateTabs m_CurrentTab = JoinCreateTabs.Join;
+
+        public JoinCreateTabs CurrentTab
+        {
+            get => m_CurrentTab;
+            set
+            {
+                m_CurrentTab = value;
+                m_OnTabChanged?.Invoke(m_CurrentTab);
+            }
+        }
+
+        public void SetJoinTab()
+        {
+            CurrentTab = JoinCreateTabs.Join;
+        }
+
+        public void SetCreateTab()
+        {
+            CurrentTab = JoinCreateTabs.Create;
+        }
+
+                m_OnTabChanged?.Invoke(m_CurrentTab);
                 Show(false);
             }
             else

Assets/Scripts/UI/JoinMenuUI.cs

         [SerializeField]
         TMP_InputField m_JoinCodeField;
 
+        public JoinCreateLobbyUI m_JoinCreateLobbyUI;
         /// <summary>
         /// Key: Lobby ID, Value Lobby UI
         /// </summary>
         /// <summary>Contains some amount of information used to join an existing lobby.</summary>
         LocalLobby.LobbyData m_LocalLobbySelected;
+
+        public override void Start()
+        {
+            base.Start();
+            m_JoinCreateLobbyUI.m_OnTabChanged.AddListener(OnTabChanged);
+        }
+
+        void OnTabChanged(JoinCreateTabs tabState)
+        {
+            if (tabState == JoinCreateTabs.Join)
+            {
+                Show();
+            }
+            else
+            {
+                Hide();
+            }
+        }
 
         public void LobbyButtonSelected(LocalLobby lobby)
         {