diff --git a/src/AcDream.App/UI/Layout/ChatWindowController.cs b/src/AcDream.App/UI/Layout/ChatWindowController.cs
index 44012ce1..ff31b824 100644
--- a/src/AcDream.App/UI/Layout/ChatWindowController.cs
+++ b/src/AcDream.App/UI/Layout/ChatWindowController.cs
@@ -492,6 +492,11 @@ public sealed class ChatWindowController : IRetainedWindowStateController, IReta
                 if (labelInfo.FontDid != 0u
                     && resolveFont?.Invoke(labelInfo.FontDid) is { } buttonFont)
                     menu.ButtonDatFont = buttonFont;
+                // The child spans the FULL 46x17 with H=Center (probed) —
+                // retail centers 'Chat'/'Gen' in the whole face, not at a
+                // fixed left indent (owner screenshot pair, 2026-08-24).
+                menu.ButtonTextCentered =
+                    labelInfo.HJustify == HJustify.Center;
             }
             menu.NormalSprite = MenuNormal; menu.PressedSprite = MenuPressed;
             menu.PopupBgSprite = MenuPopupBg;
diff --git a/tests/AcDream.App.Tests/UI/Layout/ChatLayoutConformanceTests.cs b/tests/AcDream.App.Tests/UI/Layout/ChatLayoutConformanceTests.cs
index 502087ca..bb7ff5b6 100644
--- a/tests/AcDream.App.Tests/UI/Layout/ChatLayoutConformanceTests.cs
+++ b/tests/AcDream.App.Tests/UI/Layout/ChatLayoutConformanceTests.cs
@@ -768,8 +768,10 @@ public class ChatLayoutConformanceTests
         Assert.Equal(46f, menu.Width);
         menu.OnSelect!.Invoke(ChatChannelKind.General);
         Assert.Equal(46f, menu.Width);
-        // Authored caption color: pure white.
+        // Authored caption color: pure white; authored H=Center over the
+        // full 46x17 face (not the synthetic 20px left indent).
         Assert.Equal(new System.Numerics.Vector4(1f, 1f, 1f, 1f), menu.TextColor);
+        Assert.True(menu.ButtonTextCentered);
 
         var send = Assert.IsType<UiButton>(layout.FindElement(0x10000019u));
         Assert.Equal(new System.Numerics.Vector4(1f, 1f, 1f, 1f), send.LabelColor);