Adding in a color field to the lobbies, and the ability to filter by color in the lobby list. I still need to ensure the additional UI works for arbitrary aspect ratios.

Assets/Prefabs/UI/JoinCreateCanvas.prefab

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Assets/Prefabs/UI/LobbyButtonUI.prefab

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Assets/Scenes/mainScene.unity

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Assets/Scripts/Entities/GameStateManager.cs

         RelayUtpSetup m_relaySetup;
         RelayUtpClient m_relayClient;
 
+        /// <summary>Rather than a setter, this is usable in-editor. It won't accept an enum, however.</summary>
+        public void SetLobbyColorFilter(int color) { m_lobbyColorFilter = (LobbyColor)color; }
+        private LobbyColor m_lobbyColorFilter;
+
         public void Awake()
         {
             LogHandler.Get().mode = m_logMode;
                         if (er != null)
                             errorLong = er.Status;
                         OnRefreshFailed(errorLong);
-                    });
+                    },
+                    m_lobbyColorFilter);
             }
             else if (type == MessageType.ChangeGameState)
             {

Assets/Scripts/Entities/LocalLobby.cs

 
 namespace LobbyRelaySample
 {
-    [Flags]
+    [Flags] // Some UI elements will want to specify multiple states in which to be active, so this is Flags.
     public enum LobbyState
     {
         Lobby = 1,
+
+    public enum LobbyColor { None = 0, Orange = 1, Green = 2, Blue = 3 }
 
     /// <summary>
     /// A local wrapper around a lobby's remote data, with additional functionality for providing that data to UI elements and tracking local player objects.
             public bool Private { get; set; }
             public int MaxPlayerCount { get; set; }
             public LobbyState State { get; set; }
+            public LobbyColor Color { get; set; }
 
             public LobbyData(LobbyData existing)
             {
                 Private = existing.Private;
                 MaxPlayerCount = existing.MaxPlayerCount;
                 State = existing.State;
+                Color = existing.Color;
             }
 
             public LobbyData(string lobbyCode)
                 Private = false;
                 MaxPlayerCount = -1;
                 State = LobbyState.Lobby;
+                Color = LobbyColor.None;
             }
         }
 
             set
             {
                 m_data.MaxPlayerCount = value;
+                OnChanged(this);
+            }
+        }
+
+        public LobbyColor Color
+        {
+            get => m_data.Color;
+            set
+            {
+                m_data.Color = value;
                 OnChanged(this);
             }
         }

Assets/Scripts/Lobby/LobbyAPIInterface.cs

             new InProgressRequest<Response>(task, onComplete);
         }
 
-        public static void QueryAllLobbiesAsync(Action<Response<QueryResponse>> onComplete)
+        public static void QueryAllLobbiesAsync(List<QueryFilter> filters, Action<Response<QueryResponse>> onComplete)
-            QueryLobbiesRequest queryRequest = new QueryLobbiesRequest(new QueryRequest(count: k_maxLobbiesToShow));
+            QueryLobbiesRequest queryRequest = new QueryLobbiesRequest(new QueryRequest(count: k_maxLobbiesToShow, filter: filters));
             var task = LobbyService.LobbyApiClient.QueryLobbiesAsync(queryRequest);
             new InProgressRequest<Response<QueryResponse>>(task, onComplete);
         }

Assets/Scripts/Lobby/LobbyAsyncRequests.cs

 
         /// <summary>Used for getting the list of all active lobbies, without needing full info for each.</summary>
         /// <param name="onListRetrieved">If called with null, retrieval was unsuccessful. Else, this will be given a list of contents to display, as pairs of a lobby code and a display string for that lobby.</param>
-        public void RetrieveLobbyListAsync(Action<QueryResponse> onListRetrieved, Action<Response<QueryResponse>> onError = null)
+        public void RetrieveLobbyListAsync(Action<QueryResponse> onListRetrieved, Action<Response<QueryResponse>> onError = null, LobbyColor limitToColor = LobbyColor.None)
-            LobbyAPIInterface.QueryAllLobbiesAsync(OnLobbyListRetrieved);
+            List<QueryFilter> filters = new List<QueryFilter>();
+            if (limitToColor == LobbyColor.Orange)
+                filters.Add(new QueryFilter(QueryFilter.FieldOptions.N1, ((int)LobbyColor.Orange).ToString(), QueryFilter.OpOptions.EQ));
+            else if (limitToColor == LobbyColor.Green)
+                filters.Add(new QueryFilter(QueryFilter.FieldOptions.N1, ((int)LobbyColor.Green).ToString(), QueryFilter.OpOptions.EQ));
+            else if (limitToColor == LobbyColor.Blue)
+                filters.Add(new QueryFilter(QueryFilter.FieldOptions.N1, ((int)LobbyColor.Blue).ToString(), QueryFilter.OpOptions.EQ));
+
+            LobbyAPIInterface.QueryAllLobbiesAsync(filters, OnLobbyListRetrieved);
 
             void OnLobbyListRetrieved(Response<QueryResponse> response)
             {
             Dictionary<string, DataObject> dataCurr = lobby.Data ?? new Dictionary<string, DataObject>();
             foreach (var dataNew in data)
             {
-                DataObject dataObj = new DataObject(visibility: DataObject.VisibilityOptions.Public, value: dataNew.Value); // Public so that when we request the list of lobbies, we can get info about them for filtering.
+                // Special case: We want to be able to filter on our color data, so we need to supply an arbitrary index to retrieve later. Uses N# for numerics, instead of S# for strings.
+                DataObject.IndexOptions index = dataNew.Key == "Color" ? DataObject.IndexOptions.N1 : 0;
+                DataObject dataObj = new DataObject(DataObject.VisibilityOptions.Public, dataNew.Value, index); // Public so that when we request the list of lobbies, we can get info about them for filtering.
                 if (dataCurr.ContainsKey(dataNew.Key))
                     dataCurr[dataNew.Key] = dataObj;
                 else

Assets/Scripts/Lobby/LobbyContentHeartbeat.cs

             }
         }
 
-        public static Dictionary<string, string> RetrieveLobbyData(LocalLobby lobby)
+        private static Dictionary<string, string> RetrieveLobbyData(LocalLobby lobby)
-            data.Add("State", ((int)lobby.State).ToString());
+            data.Add("State", ((int)lobby.State).ToString()); // Using an int is smaller than using the enum state's name.
+            data.Add("Color", ((int)lobby.Color).ToString());
-        public static Dictionary<string, string> RetrieveUserData(LobbyUser user)
+        private static Dictionary<string, string> RetrieveUserData(LobbyUser user)
         {
             Dictionary<string, string> data = new Dictionary<string, string>();
             if (user == null || string.IsNullOrEmpty(user.ID))

Assets/Scripts/Lobby/ToLocalLobby.cs

                 MaxPlayerCount      = lobby.MaxPlayers,
                 RelayCode           = lobby.Data?.ContainsKey("RelayCode") == true ? lobby.Data["RelayCode"].Value : null, // TODO: Remove?
                 State               = lobby.Data?.ContainsKey("State") == true ? (LobbyState) int.Parse(lobby.Data["State"].Value) : LobbyState.Lobby, // TODO: Consider TryParse, just in case (and below). Although, we don't have fail logic anyway...
+                Color               = lobby.Data?.ContainsKey("Color") == true ? (LobbyColor) int.Parse(lobby.Data["Color"].Value) : LobbyColor.None
-            Dictionary<string, LobbyUser> lobbyUsers = new Dictionary<string, LobbyUser>(); // TODO: So, right, why this?
+            Dictionary<string, LobbyUser> lobbyUsers = new Dictionary<string, LobbyUser>();
             foreach (var player in lobby.Players)
             {
                 // If we already know about this player and this player is already connected to Relay, don't overwrite things that Relay might be changing.
 
                 // If the player isn't connected to Relay, or if we just don't know about them yet, get the most recent data that the lobby knows.
                 // (If we have no local representation of the player, that gets added by the LocalLobby.)
-                LobbyUser incomingData = new LobbyUser(); // TODO: This is unclear; this should be just a data object replacing that of the user, not a new user whose data are taken.
-                incomingData.IsHost = lobby.HostId.Equals(player.Id);
-                incomingData.DisplayName = player.Data?.ContainsKey("DisplayName") == true ? player.Data["DisplayName"].Value : default;
-                incomingData.Emote       = player.Data?.ContainsKey("Emote") == true ? (EmoteType)int.Parse(player.Data["Emote"].Value) : default;
-                incomingData.UserStatus  = player.Data?.ContainsKey("UserStatus") == true ? (UserStatus)int.Parse(player.Data["UserStatus"].Value) : UserStatus.Connecting;
-                incomingData.ID = player.Id;
+                LobbyUser incomingData = new LobbyUser
+                {
+                    IsHost = lobby.HostId.Equals(player.Id),
+                    DisplayName = player.Data?.ContainsKey("DisplayName") == true ? player.Data["DisplayName"].Value : default,
+                    Emote       = player.Data?.ContainsKey("Emote") == true ? (EmoteType)int.Parse(player.Data["Emote"].Value) : default,
+                    UserStatus  = player.Data?.ContainsKey("UserStatus") == true ? (UserStatus)int.Parse(player.Data["UserStatus"].Value) : UserStatus.Connecting,
+                    ID = player.Id
+                };
                 lobbyUsers.Add(incomingData.ID, incomingData);
             }
             outputToHere.CopyObserved(info, lobbyUsers);

Assets/Scripts/Tests/PlayMode/LobbyRoundtripTests.cs

             yield return new WaitForSeconds(1); // To prevent a possible 429 with the upcoming Query request, in case a previous test had one; Query requests can only occur at a rate of 1 per second.
             Response<QueryResponse> queryResponse = null;
             float timeout = 5;
-            LobbyAPIInterface.QueryAllLobbiesAsync((qr) => { queryResponse = qr; });
+            LobbyAPIInterface.QueryAllLobbiesAsync(new List<QueryFilter>(), (qr) => { queryResponse = qr; });
             while (queryResponse == null && timeout > 0)
             {   yield return new WaitForSeconds(0.25f);
                 timeout -= 0.25f;
             yield return new WaitForSeconds(1); // To prevent a possible 429 with the upcoming Query request.
             queryResponse = null;
             timeout = 5;
-            LobbyAPIInterface.QueryAllLobbiesAsync((qr) => { queryResponse = qr; });
+            LobbyAPIInterface.QueryAllLobbiesAsync(new List<QueryFilter>(), (qr) => { queryResponse = qr; });
             while (queryResponse == null && timeout > 0)
             {   yield return new WaitForSeconds(0.25f);
                 timeout -= 0.25f;
             yield return new WaitForSeconds(1); // To prevent a possible 429 with the upcoming Query request.
             Response<QueryResponse> queryResponseTwo = null;
             timeout = 5;
-            LobbyAPIInterface.QueryAllLobbiesAsync((qr) => { queryResponseTwo = qr; });
+            LobbyAPIInterface.QueryAllLobbiesAsync(new List<QueryFilter>(), (qr) => { queryResponseTwo = qr; });
             while (queryResponseTwo == null && timeout > 0)
             {   yield return new WaitForSeconds(0.25f);
                 timeout -= 0.25f;

Assets/Scripts/UI/UIPanelBase.cs

     {
         [SerializeField]
         private UnityEvent<bool> m_onVisibilityChange;
-        [SerializeField]
         bool showing;
 
         CanvasGroup m_canvasGroup;

Assets/Scripts/UI/RecolorForLobbyType.cs

+using UnityEngine;
+using UnityEngine.UI;
+
+namespace LobbyRelaySample.UI
+{
+    /// <summary>
+    /// We want to illustrate filtering the lobby list by some arbitrary variable. This will allow the lobby host to choose a color for the lobby, and will display a lobby's current color.
+    /// (Note that this isn't sent over Relay to other clients for realtime updates.)
+    /// </summary>
+    [RequireComponent(typeof(LocalLobbyObserver))]
+    public class RecolorForLobbyType : MonoBehaviour
+    {
+        private static readonly Color s_orangeColor = new Color(0.75f, 0.5f, 0.1f);
+        private static readonly Color s_greenColor  = new Color(0.5f, 1, 0.7f);
+        private static readonly Color s_blueColor   = new Color(0.75f, 0.7f, 1);
+        private static readonly Color[] s_colorsOrdered = new Color[] { Color.white, s_orangeColor, s_greenColor, s_blueColor };
+
+        [SerializeField]
+        private Graphic[] m_toRecolor;
+        private LocalLobby m_lobby;
+
+        public void UpdateLobby(LocalLobby lobby)
+        {
+            m_lobby = lobby;
+            Color color = s_colorsOrdered[(int)lobby.Color];
+            foreach (Graphic graphic in m_toRecolor)
+                graphic.color = new Color(color.r, color.g, color.b, graphic.color.a);
+        }
+
+        /// <summary>
+        /// Called in-editor by toggles to set the color of the lobby.
+        /// </summary>
+        public void ChangeColor(int color)
+        {
+            if (m_lobby != null)
+                m_lobby.Color = (LobbyColor)color;
+        }
+    }
+}

Assets/Scripts/UI/RecolorForLobbyType.cs.meta

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