diff --git a/src/vs/code/browser/workbench/workbench.ts b/src/vs/code/browser/workbench/workbench.ts
index a6ecb2026204f3..1009eaa81ca157 100644
--- a/src/vs/code/browser/workbench/workbench.ts
+++ b/src/vs/code/browser/workbench/workbench.ts
@@ -150,6 +150,8 @@ type Writeable<T> = { -readonly [P in keyof T]: T[P] };
 	config.configurationDefaults = {
 		...config.configurationDefaults,
 		'window.commandCenter': false, // Hide command center
+		'editor.scrollbar.verticalScrollbarSize': 6,
+		'editor.scrollbar.horizontalScrollbarSize': 6,
 	};
 
 
diff --git a/src/vs/editor/common/config/editorOptions.ts b/src/vs/editor/common/config/editorOptions.ts
index 9ed16c159c655f..a1161a7ec14a47 100644
--- a/src/vs/editor/common/config/editorOptions.ts
+++ b/src/vs/editor/common/config/editorOptions.ts
@@ -4121,10 +4121,11 @@ class EditorScrollbar extends BaseEditorOption<EditorOption.scrollbar, IEditorSc
 			useShadows: true,
 			verticalHasArrows: false,
 			horizontalHasArrows: false,
-			horizontalScrollbarSize: 12,
-			horizontalSliderSize: 12,
-			verticalScrollbarSize: 14,
-			verticalSliderSize: 14,
+			// MEMBRANE: thinner than upstream (12/14)
+			horizontalScrollbarSize: 6,
+			horizontalSliderSize: 6,
+			verticalScrollbarSize: 6,
+			verticalSliderSize: 6,
 			handleMouseWheel: true,
 			alwaysConsumeMouseWheel: true,
 			scrollByPage: false,
diff --git a/src/vs/workbench/contrib/membrane/browser/membraneEditorMetrics.contribution.ts b/src/vs/workbench/contrib/membrane/browser/membraneEditorMetrics.contribution.ts
index 4a76b5b20de888..d781b22d3c28f6 100644
--- a/src/vs/workbench/contrib/membrane/browser/membraneEditorMetrics.contribution.ts
+++ b/src/vs/workbench/contrib/membrane/browser/membraneEditorMetrics.contribution.ts
@@ -154,11 +154,22 @@ export class MembraneEditorMetricsContribution extends Disposable implements IWo
 			contentLeft: layoutInfo.contentLeft,
 			contentWidth: layoutInfo.contentWidth,
 			charWidth: fontInfo.typicalHalfwidthCharacterWidth,
+			editorTop: this._editorTopInWorkbench(editor),
 			lineCount,
 			linePositions,
 			...(selectionData && { selection: selectionData }),
 		};
 	}
+
+	/** Monaco widget top relative to the workbench hole Gaze sizes (tabs/breadcrumbs sit above it). */
+	private _editorTopInWorkbench(editor: ICodeEditor): number {
+		const editorDom = editor.getDomNode();
+		if (!editorDom) {
+			return 0;
+		}
+		const workbench = editorDom.closest('.monaco-workbench') ?? editorDom;
+		return editorDom.getBoundingClientRect().top - workbench.getBoundingClientRect().top;
+	}
 }
 
 registerWorkbenchContribution2(