Start with a fresh beatmap when entering editor from main menu

osu.Game/Beatmaps/BeatmapManager.cs

@@ -27,6 +27,7 @@
 using osu.Game.Online.API.Requests;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Objects;
+using osu.Game.Users;
 using Decoder = osu.Game.Beatmaps.Formats.Decoder;
 
 namespace osu.Game.Beatmaps
@@ -94,6 +95,30 @@ protected override ArchiveDownloadRequest<BeatmapSetInfo> CreateDownloadRequest(
 
         protected override bool ShouldDeleteArchive(string path) => Path.GetExtension(path)?.ToLowerInvariant() == ".osz";
 
+        public WorkingBeatmap CreateNew(RulesetInfo ruleset)
+        {
+            var set = new BeatmapSetInfo
+            {
+                Metadata = new BeatmapMetadata
+                {
+                    Artist = "unknown",
+                    Title = "unknown",
+                    Author = User.SYSTEM_USER,
+                },
+                Beatmaps = new List<BeatmapInfo>
+                {
+                    new BeatmapInfo
+                    {
+                        BaseDifficulty = new BeatmapDifficulty(),
+                        Ruleset = ruleset
+                    }
+                }
+            };
+
+            var working = Import(set).Result;
+            return GetWorkingBeatmap(working.Beatmaps.First());
+        }
+
         protected override async Task Populate(BeatmapSetInfo beatmapSet, ArchiveReader archive, CancellationToken cancellationToken = default)
         {
             if (archive != null)

osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs

@@ -33,6 +33,9 @@ public BeatmapManagerWorkingBeatmap(IResourceStore<byte[]> store, TextureStore t
 
             protected override IBeatmap GetBeatmap()
             {
+                if (BeatmapInfo.Path == null)
+                    return BeatmapInfo.Ruleset.CreateInstance().CreateBeatmapConverter(new Beatmap()).Beatmap;
+
                 try
                 {
                     using (var stream = new LineBufferedReader(store.GetStream(getPathForFile(BeatmapInfo.Path))))

osu.Game/Screens/Edit/Components/Menus/ScreenSelectionTabControl.cs

@@ -32,8 +32,6 @@ public ScreenSelectionTabControl()
                 Height = 1,
                 Colour = Color4.White.Opacity(0.2f),
             });
-
-            Current.Value = EditorScreenMode.Compose;
         }
 
         [BackgroundDependencyLoader]

osu.Game/Screens/Edit/Editor.cs

@@ -89,6 +89,14 @@ private void load(OsuColour colours, GameHost host)
             // todo: remove caching of this and consume via editorBeatmap?
             dependencies.Cache(beatDivisor);
 
+            bool isNewBeatmap = false;
+
+            if (Beatmap.Value is DummyWorkingBeatmap)
+            {
+                isNewBeatmap = true;
+                Beatmap.Value = beatmapManager.CreateNew(Ruleset.Value);
+            }
+
             try
             {
                 playableBeatmap = Beatmap.Value.GetPlayableBeatmap(Beatmap.Value.BeatmapInfo.Ruleset);
@@ -148,6 +156,7 @@ private void load(OsuColour colours, GameHost host)
                             Anchor = Anchor.CentreLeft,
                             Origin = Anchor.CentreLeft,
                             RelativeSizeAxes = Axes.Both,
+                            Mode = { Value = isNewBeatmap ? EditorScreenMode.SongSetup : EditorScreenMode.Compose },
                             Items = new[]
                             {
                                 new MenuItem("File")

osu.Game/Screens/Menu/MainMenu.cs

@@ -98,7 +98,11 @@ private void load(BeatmapListingOverlay beatmapListing, SettingsOverlay settings
                     {
                         buttons = new ButtonSystem
                         {
-                            OnEdit = delegate { this.Push(new Editor()); },
+                            OnEdit = delegate
+                            {
+                                Beatmap.SetDefault();
+                                this.Push(new Editor());
+                            },
                             OnSolo = onSolo,
                             OnMulti = delegate { this.Push(new Multiplayer()); },
                             OnExit = confirmAndExit,