diff --git a/src-tauri/.gitignore b/src-tauri/.gitignore
index b21bd68..61f45a0 100644
--- a/src-tauri/.gitignore
+++ b/src-tauri/.gitignore
@@ -2,6 +2,10 @@
 # will have compiled files and executables
 /target/
 
+# Local-only Cargo target dir used when running `cargo test --target-dir target-test`
+# to keep test artifacts separate from `cargo tauri dev/build` output.
+/target-test/
+
 # Generated by Tauri
 # will have schema files for capabilities auto-completion
 /gen/schemas
diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index 0b8fb98..4cd93f2 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -330,7 +330,7 @@ checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "beanfun"
-version = "5.9.3"
+version = "5.9.4"
 dependencies = [
  "aes",
  "anyhow",
diff --git a/src/locales/en-US.json b/src/locales/en-US.json
index d76c4f8..1a68ee4 100644
--- a/src/locales/en-US.json
+++ b/src/locales/en-US.json
@@ -84,7 +84,7 @@
   "AutoCheckUpdate": "Notify when a new version is available",
   "RunAfterLogin": "Launch game after login",
   "MinimizeToTaskbar": "Minimize to system tray",
-  "DisableHardwareAcceleration": "Disable hardware acceleration (lower GPU usage)",
+  "DisableHardwareAcceleration": "Disable hardware acceleration",
   "MsgRestartForHardwareAccelTitle": "Restart required",
   "MsgRestartForHardwareAccel": "Hardware acceleration settings have changed. Fully exit Beanfun and start it again for the main window to use WPF software rendering.",
   "Game": "Game",
diff --git a/src/locales/zh-CN.json b/src/locales/zh-CN.json
index e39dc31..95514d8 100644
--- a/src/locales/zh-CN.json
+++ b/src/locales/zh-CN.json
@@ -73,7 +73,7 @@
   "AutoCheckUpdate": "有新版本时提示更新",
   "RunAfterLogin": "登录完成后运行游戏",
   "MinimizeToTaskbar": "最小化到通知中心",
-  "DisableHardwareAcceleration": "关闭硬件加速（降低 GPU 使用）",
+  "DisableHardwareAcceleration": "关闭硬件加速",
   "MsgRestartForHardwareAccelTitle": "需要重新启动",
   "MsgRestartForHardwareAccel": "已变更硬件加速相关设置。请完全关闭 Beanfun 后再打开，主窗口才会套用 WPF 软件渲染。",
   "Game": "游戏",
diff --git a/src/locales/zh-TW.json b/src/locales/zh-TW.json
index 23b4cc9..f0d9f41 100644
--- a/src/locales/zh-TW.json
+++ b/src/locales/zh-TW.json
@@ -84,7 +84,7 @@
   "AutoCheckUpdate": "有新版本時提示更新",
   "RunAfterLogin": "登入完成後開啟遊戲",
   "MinimizeToTaskbar": "最小化到通知中心",
-  "DisableHardwareAcceleration": "關閉硬體加速（降低 GPU 使用）",
+  "DisableHardwareAcceleration": "關閉硬體加速",
   "MsgRestartForHardwareAccelTitle": "需要重新啟動",
   "MsgRestartForHardwareAccel": "已變更硬體加速相關設定。請完全關閉 Beanfun 後再開啟，主視窗才會套用 WPF 軟體渲染。",
   "Game": "遊戲",
diff --git a/src/pages/AccountList.vue b/src/pages/AccountList.vue
index ae192e2..6fb25c6 100644
--- a/src/pages/AccountList.vue
+++ b/src/pages/AccountList.vue
@@ -313,6 +313,46 @@ function selectRow(a: ServiceAccount): void {
   account.selectedSid = a.sid
 }
 
+/**
+ * Double-click on a row → copy the row's service-account ID (`sid`)
+ * to the clipboard. Mirrors WPF `lstViewAccount_MouseDoubleClick`
+ * (`AccountList.xaml.cs`), whose only side effect was
+ * `Clipboard.SetText(selected.sid)` — paired with the WPF tooltip
+ * resource `DoubleClickCopy` ("雙擊複製帳號 / Double-click to copy
+ * account") which is still shipped via the `DoubleClickCopy` i18n
+ * key today. Banned rows fall through silently (same guard as
+ * {@link selectRow}) so the SPA mirrors WPF's "disabled rows ignore
+ * input" behaviour.
+ *
+ * Selection is intentionally **not** armed here: WPF treats the
+ * double-click as a one-shot copy, not a row-arm; mutating
+ * `selectedSid` would also flip the OTP / Start Game UI on top of
+ * the copy, which the WPF user never saw. Single-click + Enter is
+ * the ergonomic path for OTP fetch (issue #239 fixes the missing
+ * keyboard route too).
+ *
+ * The SPA bypasses the {@link clipboardWriteOtp} helper because that
+ * helper's success / failure toasts use the OTP-specific
+ * `GetOtpSuccessAndCopy` string. A generic `CopyFinished` /
+ * `CopyFailed` toast pair matches the WPF tooltip wording and keeps
+ * the OTP helper single-purpose.
+ */
+async function handleRowDblClick(a: ServiceAccount): Promise<void> {
+  if (!a.is_enable) return
+  try {
+    await navigator.clipboard.writeText(a.sid)
+    ElMessage.success(t('CopyFinished'))
+  } catch {
+    /*
+     * `navigator.clipboard.writeText` only rejects on permission /
+     * trust-boundary denial inside our Tauri webview — surface it
+     * so the user knows the buffer wasn't updated (otherwise
+     * they'd silently paste stale content into the launcher).
+     */
+    ElMessage.error(t('CopyFailed'))
+  }
+}
+
 /* --------------- logout --------------- */
 
 async function handleLogout(): Promise<void> {
@@ -2243,6 +2283,7 @@ onBeforeUnmount(() => {
                 }"
                 :data-test="`account-row-${a.sid}`"
                 @click="selectRow(a)"
+                @dblclick="handleRowDblClick(a)"
               >
                 <span
                   class="account-list__row-grip"
@@ -2253,9 +2294,8 @@ onBeforeUnmount(() => {
                 <span class="account-list__row-num">{{ idx + 1 }}</span>
                 <div class="account-list__row-info">
                   <p class="account-list__row-name">{{ a.sname }}</p>
-                  <p class="account-list__row-sub">
-                    <template v-if="a.is_enable">ID: {{ a.sid }}</template>
-                    <template v-else>{{ t('accountList.statusBanned') }}</template>
+                  <p v-if="!a.is_enable" class="account-list__row-sub">
+                    {{ t('accountList.statusBanned') }}
                   </p>
                 </div>
                 <el-dropdown
@@ -2880,7 +2920,7 @@ onBeforeUnmount(() => {
   display: flex;
   align-items: center;
   gap: 0.625rem;
-  padding: 0.625rem 0.75rem;
+  padding: 0.4375rem 0.75rem;
   border-radius: var(--bf-radius-card);
   cursor: pointer;
   position: relative;
diff --git a/src/router/index.ts b/src/router/index.ts
index 112d086..702be28 100644
--- a/src/router/index.ts
+++ b/src/router/index.ts
@@ -263,7 +263,7 @@ export const routes: RouteRecordRaw[] = [
     meta: {
       titleKey: 'titleBar.settings',
       titleIcon: 'settings',
-      windowWidth: 880,
+      windowWidth: 660,
       windowHeight: 680,
     },
     /*
diff --git a/tests/unit/pages/AccountList.spec.ts b/tests/unit/pages/AccountList.spec.ts
index c44f506..98ef2ac 100644
--- a/tests/unit/pages/AccountList.spec.ts
+++ b/tests/unit/pages/AccountList.spec.ts
@@ -853,12 +853,12 @@ describe('AccountList page', () => {
     const rows = wrapper.findAll('.account-list__row')
     expect(rows).toHaveLength(3)
     expect(rows[0].text()).toContain('Main Toon')
-    expect(rows[0].text()).toContain('sid-1')
     expect(rows[1].text()).toContain('Mule Account')
     expect(rows[2].text()).toContain('Suspended User')
     /*
-     * The banned row swaps the ID line for the localized
-     * "Disabled" copy — proves the conditional branch fires.
+     * The banned row shows the localized "Disabled" copy as a
+     * subtitle — proves the conditional branch fires. Enabled
+     * rows show only the display name (no ID subtitle).
      */
     expect(rows[2].text()).toContain(i18nMessages['zh-TW'].accountList.statusBanned)
     expect(rows[2].classes()).toContain('account-list__row--banned')
@@ -917,6 +917,61 @@ describe('AccountList page', () => {
     expect(account.selectedSid).toBe('sid-1')
   })
 
+  it('double-clicking an enabled row copies sid to clipboard (WPF parity, issue #239)', async () => {
+    /*
+     * WPF `lstViewAccount_MouseDoubleClick` only called
+     * `Clipboard.SetText(selected.sid)` — no row-arm, no OTP fetch.
+     * Mirror that here: the dblclick must hit `clipboard.writeText`
+     * with the row's sid and surface a generic `CopyFinished` toast,
+     * without touching `account.selectedSid` or `commands.getOtp`
+     * (those belong to the single-click + Enter path; auto-select
+     * from PR #245 is what arms the initial selection on mount).
+     */
+    vi.mocked(commands.getAccounts).mockReturnValueOnce(ok(POPULATED_LIST))
+    const clipboard = installClipboardMock()
+
+    const ctx = buildHarness()
+    const wrapper = await ctx.mountIt()
+    await flushPromises()
+
+    const account = useAccountStore()
+    /*
+     * Snapshot whatever the auto-select from PR #245 armed on
+     * mount; the dblclick on sid-2 must NOT mutate it (otherwise
+     * the OTP / Start Game UI would silently flip to point at the
+     * just-copied row, which the WPF user never saw).
+     */
+    const selectedBeforeDblClick = account.selectedSid
+
+    await wrapper.get('[data-test="account-row-sid-2"]').trigger('dblclick')
+    await flushPromises()
+
+    expect(clipboard.writeText).toHaveBeenCalledTimes(1)
+    expect(clipboard.writeText).toHaveBeenCalledWith('sid-2')
+    expect(ElMessage.success).toHaveBeenCalledWith(i18nMessages['zh-TW'].CopyFinished)
+    expect(commands.getOtp).not.toHaveBeenCalled()
+    expect(account.selectedSid).toBe(selectedBeforeDblClick)
+  })
+
+  it('double-clicking a banned row is a no-op (mirrors the single-click guard)', async () => {
+    vi.mocked(commands.getAccounts).mockReturnValueOnce(ok(POPULATED_LIST))
+    const clipboard = installClipboardMock()
+
+    const ctx = buildHarness()
+    const wrapper = await ctx.mountIt()
+    await flushPromises()
+
+    const account = useAccountStore()
+    const selectedBeforeDblClick = account.selectedSid
+
+    await wrapper.get('[data-test="account-row-sid-3"]').trigger('dblclick')
+    await flushPromises()
+
+    expect(clipboard.writeText).not.toHaveBeenCalled()
+    expect(commands.getOtp).not.toHaveBeenCalled()
+    expect(account.selectedSid).toBe(selectedBeforeDblClick)
+  })
+
   it('logout: confirm → auth.logout → account.clearSessionData → /login', async () => {
     vi.mocked(commands.getAccounts).mockReturnValueOnce(ok(POPULATED_LIST))
     vi.mocked(commands.logout).mockReturnValueOnce(ok(null))