diff --git a/packages/client/ui-chat/src/chat-settings.ts b/packages/client/ui-chat/src/chat-settings.ts
index c951a534eb..7335a49db5 100644
--- a/packages/client/ui-chat/src/chat-settings.ts
+++ b/packages/client/ui-chat/src/chat-settings.ts
@@ -9,22 +9,27 @@ export const CHAT_SETTINGS_NAMESPACE = 'ui-chat'
 export const TRANSCRIPT_VIEW_FIELD = 'transcriptView'
 
 /** Work-details presentation modes a user can choose. */
-export const TRANSCRIPT_VIEW_MODES = ['compact', 'detailed', 'expanded'] as const
+export const TRANSCRIPT_VIEW_MODES = ['compact', 'standard', 'detailed', 'verbose'] as const
 
 /** Work-details presentation mode. */
 export type TranscriptViewMode = typeof TRANSCRIPT_VIEW_MODES[number]
 
 /**
- * Saved value from the two-mode generation of this setting. Read as `detailed`;
+ * Saved value from the two-mode generation of this setting. Read as `standard`;
  * never offered as a choice and never written back.
  */
 export const LEGACY_TRANSCRIPT_VIEW_MODE = 'normal'
 
-/** Every value the durable field accepts: current modes plus the legacy saved value. */
-const TRANSCRIPT_VIEW_SETTING_VALUES = [...TRANSCRIPT_VIEW_MODES, LEGACY_TRANSCRIPT_VIEW_MODE] as const
+/** Saved `expanded` values read as `detailed`, without being offered or written back. */
+export const LEGACY_EXPANDED_TRANSCRIPT_VIEW_MODE = 'expanded'
 
-/** Default preserves the compact process disclosure introduced by Chat. */
-export const DEFAULT_TRANSCRIPT_VIEW_MODE: TranscriptViewMode = 'compact'
+/** Every value the durable field accepts: current modes plus legacy saved values. */
+const TRANSCRIPT_VIEW_SETTING_VALUES = [
+  ...TRANSCRIPT_VIEW_MODES, LEGACY_TRANSCRIPT_VIEW_MODE, LEGACY_EXPANDED_TRANSCRIPT_VIEW_MODE,
+] as const
+
+/** Standard process summaries for users without an explicit preference. */
+export const DEFAULT_TRANSCRIPT_VIEW_MODE: TranscriptViewMode = 'standard'
 
 /** Performance and usage detail levels accepted by user settings. */
 export const PERFORMANCE_USAGE_MODES = ['compact', 'detailed'] as const
@@ -43,8 +48,8 @@ export const DEFAULT_LINK_OPENING: LinkOpening = 'sidebar'
 
 /** Durable Chat section shared by the Host schema and browser scope. */
 export interface ChatSettings {
-  /** Work-details preference; the legacy value is accepted only from existing saved settings. */
-  transcriptView: TranscriptViewMode | typeof LEGACY_TRANSCRIPT_VIEW_MODE
+  /** Work-details preference; legacy values are accepted only from existing saved settings. */
+  transcriptView: TranscriptViewMode | typeof LEGACY_TRANSCRIPT_VIEW_MODE | typeof LEGACY_EXPANDED_TRANSCRIPT_VIEW_MODE
   /** Detail level for composer statistics and completed-Turn usage. */
   performanceUsage: PerformanceUsageMode
   /** Default destination for Chat HTTP(S) links. */
@@ -55,7 +60,8 @@ export interface ChatSettings {
 export const ChatSettingsFields = {
   linkOpening: z.union(['sidebar', 'new-tab']).default(DEFAULT_LINK_OPENING),
   performanceUsage: z.union([...PERFORMANCE_USAGE_MODES]).default(DEFAULT_PERFORMANCE_USAGE),
-  [TRANSCRIPT_VIEW_FIELD]: z.union([...TRANSCRIPT_VIEW_SETTING_VALUES]).default(DEFAULT_TRANSCRIPT_VIEW_MODE),
+  // Missing and unrecognized modes both use Standard.
+  [TRANSCRIPT_VIEW_FIELD]: z.union([...TRANSCRIPT_VIEW_SETTING_VALUES]).default(DEFAULT_TRANSCRIPT_VIEW_MODE).loose(),
 }
 
 /** Schema for shared configuration values. */
diff --git a/packages/client/ui-chat/src/client/chat/ChatGroupSeat.tsx b/packages/client/ui-chat/src/client/chat/ChatGroupSeat.tsx
index 2944f85c38..e09a0d9504 100644
--- a/packages/client/ui-chat/src/client/chat/ChatGroupSeat.tsx
+++ b/packages/client/ui-chat/src/client/chat/ChatGroupSeat.tsx
@@ -138,7 +138,8 @@ export const ChatGroupSeat = memo(function ChatGroupSeat({ groupKey, useChatGrou
     const location = node?.location
     return location?.kind === 'turn' || location?.kind === 'step' ? location.turn : undefined
   })
-  const grouped = props.usePresentation(policy => turnLocation?.status !== 'open' || policy.stepGrouping !== 'none')
+  const grouped = props.usePresentation(policy => policy.stepGrouping === 'collapsed'
+    || (policy.stepGrouping === 'history' && turnLocation?.status !== 'open'))
   const reason = turnLocation?.end?.data.reason.kind
   const alwaysOpen = presentation?.turnClosed === false || presentation?.hasInterleavedInput === true
     || reason === 'aborted' || reason === 'error'
diff --git a/packages/client/ui-chat/src/client/locale.ts b/packages/client/ui-chat/src/client/locale.ts
index 0c4810c7aa..ce0ca17b07 100644
--- a/packages/client/ui-chat/src/client/locale.ts
+++ b/packages/client/ui-chat/src/client/locale.ts
@@ -100,11 +100,12 @@ export const zh = {
   'settings.links.description': '对话中网页链接的打开位置',
   'settings.links.sidebar': '应用内侧边栏',
   'settings.links.newTab': '默认浏览器',
-  'settings.transcript.title': '工作过程展示',
-  'settings.transcript.description': '控制轮次和步骤的默认展开方式',
+  'settings.transcript.title': '工作步骤展示',
+  'settings.transcript.description': '选择希望看到多少工具调用细节',
   'settings.transcript.compact': '简洁',
+  'settings.transcript.standard': '标准',
   'settings.transcript.detailed': '详细',
-  'settings.transcript.expanded': '完全展开',
+  'settings.transcript.verbose': '完全展开',
   'fileOpen.title': '无法打开文件',
   'fileOpen.unknown': '无法打开此文件',
   'message.extraBlock': '附加内容块',
@@ -281,10 +282,11 @@ export const en = {
   'settings.links.sidebar': 'In-App Sidebar',
   'settings.links.newTab': 'Default Browser',
   'settings.transcript.title': 'Work details',
-  'settings.transcript.description': 'Controls how turns and steps expand by default',
+  'settings.transcript.description': 'Choose how much detail to show for tool calls',
   'settings.transcript.compact': 'Compact',
+  'settings.transcript.standard': 'Standard',
   'settings.transcript.detailed': 'Detailed',
-  'settings.transcript.expanded': 'Expanded',
+  'settings.transcript.verbose': 'Verbose',
   'fileOpen.title': 'Couldn’t open file',
   'fileOpen.unknown': 'Couldn’t open this file',
   'message.extraBlock': 'Extra content block',
diff --git a/packages/client/ui-chat/src/client/presentation-policy.ts b/packages/client/ui-chat/src/client/presentation-policy.ts
index 3b570228dc..5b3ee1a7d5 100644
--- a/packages/client/ui-chat/src/client/presentation-policy.ts
+++ b/packages/client/ui-chat/src/client/presentation-policy.ts
@@ -13,8 +13,8 @@ export interface ChatPresentationPolicy {
   readonly mode: TranscriptViewMode
   /** Whether a normally completed Turn folds its process rows behind the whole-Turn control. */
   readonly foldCompletedTurns: boolean
-  /** Whether running Turns' secondary groups expose a collapsible header; historical groups always do. */
-  readonly stepGrouping: 'collapsed' | 'none'
+  /** Collapsible group headers for all Turns, historical Turns only, or no Turns. */
+  readonly stepGrouping: 'collapsed' | 'history' | 'none'
   /** Show the running command, path, query, or reasoning detail in group titles. */
   readonly liveProcessDetail: boolean
   /** Whether a settled reasoning row previews its first line beside the Think title. */
@@ -29,20 +29,27 @@ const POLICIES: Readonly<Record<TranscriptViewMode, ChatPresentationPolicy>> = {
     liveProcessDetail: false,
     settledReasoningPreview: false,
   },
-  detailed: {
-    mode: 'detailed',
+  standard: {
+    mode: 'standard',
     foldCompletedTurns: true,
     stepGrouping: 'collapsed',
     liveProcessDetail: true,
     settledReasoningPreview: true,
   },
-  expanded: {
-    mode: 'expanded',
+  detailed: {
+    mode: 'detailed',
     foldCompletedTurns: true,
-    stepGrouping: 'none',
+    stepGrouping: 'history',
     liveProcessDetail: true,
     settledReasoningPreview: true,
   },
+  verbose: {
+    mode: 'verbose',
+    foldCompletedTurns: false,
+    stepGrouping: 'none',
+    liveProcessDetail: false,
+    settledReasoningPreview: true,
+  },
 }
 
 /**
diff --git a/packages/client/ui-chat/src/client/settings/TranscriptViewRow.tsx b/packages/client/ui-chat/src/client/settings/TranscriptViewRow.tsx
index 2b29abacd9..14d2d58703 100644
--- a/packages/client/ui-chat/src/client/settings/TranscriptViewRow.tsx
+++ b/packages/client/ui-chat/src/client/settings/TranscriptViewRow.tsx
@@ -24,8 +24,9 @@ export type TranscriptViewRowProps =
 
 const LABELS = {
   compact: 'settings.transcript.compact',
+  standard: 'settings.transcript.standard',
   detailed: 'settings.transcript.detailed',
-  expanded: 'settings.transcript.expanded',
+  verbose: 'settings.transcript.verbose',
 } as const satisfies Record<TranscriptViewMode, ChatKey>
 
 /**
diff --git a/packages/client/ui-chat/src/client/transcript-view.ts b/packages/client/ui-chat/src/client/transcript-view.ts
index 2a71ed74c0..e7f6cc4fde 100644
--- a/packages/client/ui-chat/src/client/transcript-view.ts
+++ b/packages/client/ui-chat/src/client/transcript-view.ts
@@ -3,14 +3,14 @@
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { ConfigForm } from '@deepseek-ai/dsh-client-ui-settings/client'
 import {
-  DEFAULT_TRANSCRIPT_VIEW_MODE, LEGACY_TRANSCRIPT_VIEW_MODE, TRANSCRIPT_VIEW_FIELD,
+  DEFAULT_TRANSCRIPT_VIEW_MODE, LEGACY_TRANSCRIPT_VIEW_MODE, LEGACY_EXPANDED_TRANSCRIPT_VIEW_MODE, TRANSCRIPT_VIEW_FIELD,
   type ChatSettings, type TranscriptViewMode,
 } from '../chat-settings.ts'
 
 /** Live work-details preference consumed by Chat and its Settings row. */
 export class TranscriptViewPolicy {
   private readonly unsubscribe: () => void
-  /** Reactive current mode; defaults to Compact before Host settings arrive. */
+  /** Reactive current mode; defaults to Standard before Host settings arrive. */
   readonly mode: SnapshotStore<TranscriptViewMode> = createSnapshotStore(DEFAULT_TRANSCRIPT_VIEW_MODE)
 
   /**
@@ -26,7 +26,7 @@ export class TranscriptViewPolicy {
 
   /**
    * Publish and persist one explicit user choice.
-   * @param mode - Compact, Detailed, or Expanded work details.
+   * @param mode - Compact, Standard, Detailed, or Verbose work details.
    */
   setMode(mode: TranscriptViewMode): void {
     if (this.mode.getSnapshot() === mode) return
@@ -38,7 +38,9 @@ export class TranscriptViewPolicy {
   private adopt(): void {
     const section = this.host.getSnapshot().value
     if (section === undefined) return
-    const mode = section.transcriptView === LEGACY_TRANSCRIPT_VIEW_MODE ? 'detailed' : section.transcriptView
+    const saved = section.transcriptView
+    const mode = saved === LEGACY_TRANSCRIPT_VIEW_MODE ? 'standard'
+      : saved === LEGACY_EXPANDED_TRANSCRIPT_VIEW_MODE ? 'detailed' : saved
     if (this.mode.getSnapshot() !== mode) this.mode.set(mode)
   }
 }
diff --git a/packages/client/ui-chat/src/index.ts b/packages/client/ui-chat/src/index.ts
index 036ea0cc0d..fabb8cf7df 100644
--- a/packages/client/ui-chat/src/index.ts
+++ b/packages/client/ui-chat/src/index.ts
@@ -9,7 +9,7 @@ import { TRANSCRIPT_VIEW_FIELD } from './chat-settings.ts'
 import { ChatSettingsFields } from './chat-settings.ts'
 
 export {
-  CHAT_SETTINGS_NAMESPACE, DEFAULT_TRANSCRIPT_VIEW_MODE, LEGACY_TRANSCRIPT_VIEW_MODE, TRANSCRIPT_VIEW_FIELD,
+  CHAT_SETTINGS_NAMESPACE, DEFAULT_TRANSCRIPT_VIEW_MODE, LEGACY_TRANSCRIPT_VIEW_MODE, LEGACY_EXPANDED_TRANSCRIPT_VIEW_MODE, TRANSCRIPT_VIEW_FIELD,
   TRANSCRIPT_VIEW_MODES, type ChatSettings, type TranscriptViewMode,
 } from './chat-settings.ts'