diff --git a/BENCH-NOTES.md b/BENCH-NOTES.md
index 5231cfec64f8..98630e4d3043 100644
--- a/BENCH-NOTES.md
+++ b/BENCH-NOTES.md
@@ -228,3 +228,5 @@
2026-08-22 07:33 · Unified info, danger and offline underlap rows at a vertically centered height with quieter borders · ui/src/styles/chat/layout.css · COMPONENT #124301 multiline | BENCH
2026-08-22 07:33 · Projected the canonical reconnect badge onto every queued row while the composer is offline · ui/src/pages/chat/components/chat-composer-view.ts, ui/src/pages/chat/components/chat-composer-queue.ts · COMPONENT #124301 multiline | BENCH
2026-08-22 07:33 · Matched running tasks to composer and Plan chrome and aligned both on one shared status row when they coexist · ui/src/styles/chat/tool-cards.css, ui/src/test-helpers/composer-bench.ts, ui/src/test-helpers/composer-bench.css · COMPONENT #124301 multiline | BENCH
+2026-08-22 07:36 · Moved the scenario sweep out of the Composer panel into a full-width top card aligned with Width and Theme · scripts/control-ui-mock-dev.ts, ui/src/test-helpers/composer-bench.css · COMPONENT #124301 multiline | BENCH
+2026-08-22 07:36 · Made Desktop the opening width and mapped its slider endpoint to the full available bench stage · scripts/control-ui-mock-dev.ts, ui/src/test-helpers/composer-bench.ts, ui/src/test-helpers/composer-bench.css · COMPONENT #124301 multiline | BENCH
diff --git a/ITERATION-NOTES.md b/ITERATION-NOTES.md
index c3d106b60f5f..46c884313d21 100644
--- a/ITERATION-NOTES.md
+++ b/ITERATION-NOTES.md
@@ -119,6 +119,8 @@ Local-only working ledger. Re-read after every implementation block; move an ite
- [x] Vertically center every lower composer status band and soften info, danger, and offline borders.
- [x] Show the canonical reconnect pill on every queued row while offline.
- [x] Match running tasks to Plan/composer chrome and share one horizontal status row when both appear.
+- [x] Move the scenario sweep into the top rail between the view card and Composer controls.
+- [x] Default Width to Desktop and let its endpoint fill the available bench stage.
## Observed queue contract
diff --git a/scripts/control-ui-mock-dev.ts b/scripts/control-ui-mock-dev.ts
index 749ee73a10e3..24dd8a792661 100644
--- a/scripts/control-ui-mock-dev.ts
+++ b/scripts/control-ui-mock-dev.ts
@@ -178,15 +178,6 @@ const composerBenchHtml = `