diff --git a/ui/src/pages/chat/chat-send.test.ts b/ui/src/pages/chat/chat-send.test.ts
index bd1d22a6f142..dda1d98f93ec 100644
--- a/ui/src/pages/chat/chat-send.test.ts
+++ b/ui/src/pages/chat/chat-send.test.ts
@@ -411,7 +411,13 @@ function makeHost(overrides?: MakeHostOverrides): TestChatHost | TestChatHostWit
     chatProgrammaticScrollTarget: 0,
     applySettings: vi.fn((patch: Partial<UiSettings>) => {
       // Chat pages own display/layout settings; active-session persistence belongs to pane bindings.
-      Object.assign(settings, patch);
+      const next = { ...settings, ...patch };
+      Object.assign(settings, {
+        chatShowThinking: next.chatShowThinking,
+        chatShowToolCalls: next.chatShowToolCalls,
+        chatPersistCommentary: next.chatPersistCommentary,
+        chatSendShortcut: next.chatSendShortcut,
+      });
     }),
     ...hostOverrides,
     settings,
diff --git a/ui/src/pages/chat/chat-state-page.ts b/ui/src/pages/chat/chat-state-page.ts
index 4a4837edaac6..00d959819058 100644
--- a/ui/src/pages/chat/chat-state-page.ts
+++ b/ui/src/pages/chat/chat-state-page.ts
@@ -264,7 +264,13 @@ export function createPageState(
   state.handleChatDraftChange = (next) => handleChatDraftChange(state, next);
   state.handleChatInputHistoryKey = (input) => handleChatInputHistoryKey(state, input);
   state.applySettings = (patch) => {
-    state.settings = patchSettings(patch);
+    const next = { ...state.settings, ...patch };
+    state.settings = patchSettings({
+      chatShowThinking: next.chatShowThinking,
+      chatShowToolCalls: next.chatShowToolCalls,
+      chatPersistCommentary: next.chatPersistCommentary,
+      chatSendShortcut: next.chatSendShortcut,
+    });
     renderLifecycle.invalidate();
   };
   state.setChatViewMenuOpen = (open, options) => {