diff --git a/app/page.jsx b/app/page.jsx
index 8c44694..fd3b208 100644
--- a/app/page.jsx
+++ b/app/page.jsx
@@ -2,7 +2,7 @@ import ScenarioForm from "@/components/scenario-form";
 
 export default function Home() {
   return (
-    <main className="mx-auto max-w-2xl px-6 py-12">
+    <main className="mx-auto max-w-[1600px] px-6 py-12">
       <h1 className="mb-2 text-3xl font-bold tracking-tight">Confidence Engine</h1>
       <p className="mb-8 text-sm text-gray-500">
         Experimental prototype: enter a scenario and send it to a local LLM for
diff --git a/docs/design-evolution-log.md b/docs/design-evolution-log.md
index cd690ce..e39fb93 100644
--- a/docs/design-evolution-log.md
+++ b/docs/design-evolution-log.md
@@ -97,6 +97,19 @@ The user contributes evidence.
 
 The workspace captures shared understanding.
 
+### Experiment 01 — Wider canvas
+
+Hypothesis:
+The document-like feeling is caused partly by the narrow outer container.
+
+Change:
+Increase the available desktop workspace width without rearranging any components.
+
+Evaluation:
+Pending visual review.
+
+---
+
 ## Current Open Questions
 
 The following are active explorations rather than decisions.