Tidy up GroupMode enum

osu.Game.Tests/Visual/SongSelectV2/SongSelectTestScene.cs

@@ -130,7 +130,7 @@ namespace osu.Game.Tests.Visual.SongSelectV2
                 SelectedMods.SetDefault();
 
                 Config.SetValue(OsuSetting.SongSelectSortingMode, SortMode.Title);
-                Config.SetValue(OsuSetting.SongSelectGroupingMode, GroupMode.All);
+                Config.SetValue(OsuSetting.SongSelectGroupingMode, GroupMode.NoGrouping);
 
                 SongSelect = null!;
             });

osu.Game.Tests/Visual/SongSelectV2/TestSceneBeatmapCarousel.cs

@@ -33,7 +33,7 @@ namespace osu.Game.Tests.Visual.SongSelectV2
         [Explicit]
         public void TestSorting()
         {
-            SortAndGroupBy(SortMode.Artist, GroupMode.All);
+            SortAndGroupBy(SortMode.Artist, GroupMode.NoGrouping);
             SortAndGroupBy(SortMode.Difficulty, GroupMode.Difficulty);
             SortAndGroupBy(SortMode.Artist, GroupMode.Artist);
         }

osu.Game.Tests/Visual/SongSelectV2/TestSceneBeatmapCarouselNoGrouping.cs

@@ -243,7 +243,7 @@ namespace osu.Game.Tests.Visual.SongSelectV2
             AddBeatmaps(2, 3);
             WaitForDrawablePanels();
 
-            SortAndGroupBy(SortMode.Difficulty, GroupMode.All);
+            SortAndGroupBy(SortMode.Difficulty, GroupMode.NoGrouping);
             WaitForFiltering();
 
             AddUntilStep("standalone panels displayed", () => GetVisiblePanels<PanelBeatmapStandalone>().Any());

osu.Game.Tests/Visual/UserInterface/TestSceneTabControl.cs

@@ -30,8 +30,8 @@ namespace osu.Game.Tests.Visual.UserInterface
                 Position = new Vector2(275, 5)
             });
 
-            filter.PinItem(GroupMode.All);
-            filter.PinItem(GroupMode.RecentlyPlayed);
+            filter.PinItem(GroupMode.NoGrouping);
+            filter.PinItem(GroupMode.LastPlayed);
 
             filter.Current.ValueChanged += grouping =>
             {

osu.Game/Configuration/OsuConfigManager.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Configuration
             SetDefault(OsuSetting.DisplayStarsMinimum, 0.0, 0, 10, 0.1);
             SetDefault(OsuSetting.DisplayStarsMaximum, 10.1, 0, 10.1, 0.1);
 
-            SetDefault(OsuSetting.SongSelectGroupingMode, GroupMode.All);
+            SetDefault(OsuSetting.SongSelectGroupingMode, GroupMode.NoGrouping);
             SetDefault(OsuSetting.SongSelectSortingMode, SortMode.Title);
 
             SetDefault(OsuSetting.RandomSelectAlgorithm, RandomSelectAlgorithm.RandomPermutation);
@@ -263,6 +263,10 @@ namespace osu.Game.Configuration
                 if (RuntimeInfo.IsMobile)
                     GetBindable<float>(OsuSetting.UIScale).SetDefault();
             }
+
+            if (combined < 20250518)
+                // GroupMode.All, the previous default grouping mode, is made obsolete and to be removed in favour of GroupMode.NoGrouping.
+                GetBindable<GroupMode>(OsuSetting.SongSelectGroupingMode).SetDefault();
         }
 
         public override TrackedSettings CreateTrackedSettings()

osu.Game/Screens/Select/Filter/GroupMode.cs

@@ -1,14 +1,15 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.ComponentModel;
 
 namespace osu.Game.Screens.Select.Filter
 {
     public enum GroupMode
     {
-        [Description("All")]
-        All,
+        [Description("No Grouping")]
+        NoGrouping,
 
         [Description("Artist")]
         Artist,
@@ -37,19 +38,19 @@ namespace osu.Game.Screens.Select.Filter
         [Description("My Maps")]
         MyMaps,
 
-        [Description("No Grouping")]
-        NoGrouping,
-
         [Description("Rank Achieved")]
         RankAchieved,
 
         [Description("Ranked Status")]
         RankedStatus,
 
-        [Description("Recently Played")]
-        RecentlyPlayed,
+        [Description("Last Played")]
+        LastPlayed,
 
         [Description("Title")]
-        Title
+        Title,
+
+        [Obsolete($"Use {nameof(NoGrouping)} instead.")] // todo: remove in 20251018
+        All,
     }
 }

osu.Game/Screens/SelectV2/FilterControl.cs

@@ -162,7 +162,9 @@ namespace osu.Game.Screens.SelectV2
                                     groupDropdown = new ShearedDropdown<GroupMode>("Group by")
                                     {
                                         RelativeSizeAxes = Axes.X,
-                                        Items = Enum.GetValues<GroupMode>(),
+#pragma warning disable CS0618 // Type or member is obsolete
+                                        Items = Enum.GetValues<GroupMode>().Where(m => m != GroupMode.All),
+#pragma warning restore CS0618 // Type or member is obsolete
                                     },
                                     Empty(),
                                     collectionDropdown = new CollectionDropdown