diff --git a/frontend/compare.css b/frontend/compare.css
index 5db7ce6..6966afb 100644
--- a/frontend/compare.css
+++ b/frontend/compare.css
@@ -10,7 +10,7 @@ button:focus-visible, select:focus-visible, .surface:focus-visible { outline: 2p
 #scope { margin: 0; padding: 7px 16px; font-size: 11px; color: #60716b; border-bottom: 1px solid #d6dfda; }
 .workspace { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); grid-template-rows: minmax(0,1fr); }
 .menu-open .workspace { grid-template-columns: minmax(0,1fr) minmax(0,1fr) 270px; }
-body:not(.menu-open) header, body:not(.menu-open) #scope, body:not(.menu-open) aside, body:not(.menu-open) .pane h2 { display: none; }
+[data-comparison-menu][hidden] { display: none !important; }
 #menu-toggle { position: fixed; top: 12px; left: 12px; z-index: 10; width: 36px; height: 36px; display: grid; place-items: center; padding: 6px; box-shadow: 0 2px 6px #00000014; }
 #menu-toggle[aria-expanded="true"] { background: #e5eee9; }
 .pane { min-width: 0; min-height: 0; display: flex; flex-direction: column; border-right: 1px solid #d6dfda; }
diff --git a/frontend/compare.html b/frontend/compare.html
index 50ac205..ddba50d 100644
--- a/frontend/compare.html
+++ b/frontend/compare.html
@@ -1,7 +1,7 @@
 <!doctype html>
-<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Schematic comparison</title><link rel="stylesheet" href="/fonts.css"><link rel="stylesheet" href="/assets/viewer.css"><link rel="stylesheet" href="/assets/compare.css"><script type="module" src="/assets/compare.js"></script></head><body>
+<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Schematic comparison</title><link rel="stylesheet" href="/fonts.css"><link rel="stylesheet" href="/assets/viewer.css"><link rel="stylesheet" href="/assets/compare.css?v=fullscreen-menu-3"><script type="module" src="/assets/compare.js?v=fullscreen-menu-3"></script></head><body>
 <button id="menu-toggle" type="button" aria-label="Show menu" title="Show menu" aria-expanded="false" aria-controls="comparison-toolbar scope comparison-changes"><svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" aria-hidden="true"><path d="M4 6h16M4 12h16M4 18h16"/></svg></button>
-<header id="comparison-toolbar"><a href="/compare">Schematic Diff</a><div id="summary" aria-live="polite"></div><div class="controls"><label><input id="sync" type="checkbox" checked> Sync views</label><label><input id="highlights" type="checkbox" checked> Highlights</label><label><input id="only-changes" type="checkbox"> Changes only</label><button id="fit" type="button">Fit</button></div></header>
-<p id="scope">Native object comparison · Connection graphics, not a compiled electrical netlist.</p>
-<main class="workspace"><section class="pane"><h2>Original <span id="old-name"></span></h2><div id="old-surface" class="surface" tabindex="0" aria-label="Original schematic"></div></section><section class="pane"><h2>Modified <span id="new-name"></span></h2><div id="new-surface" class="surface" tabindex="0" aria-label="Modified schematic"></div></section><aside id="comparison-changes"><div class="change-controls"><label for="filter">Changes</label><select id="filter"><option value="all">All</option><option value="added">Added</option><option value="removed">Removed</option><option value="modified">Modified</option><option value="moved">Moved</option></select><button id="previous" aria-label="Previous change">↑</button><button id="next" aria-label="Next change">↓</button></div><nav id="changes" aria-label="Schematic changes"></nav><pre id="details" aria-live="polite"></pre></aside></main>
+<header id="comparison-toolbar" data-comparison-menu hidden><a href="/compare">Schematic Diff</a><div id="summary" aria-live="polite"></div><div class="controls"><label><input id="sync" type="checkbox" checked> Sync views</label><label><input id="highlights" type="checkbox" checked> Highlights</label><label><input id="only-changes" type="checkbox"> Changes only</label><button id="fit" type="button">Fit</button></div></header>
+<p id="scope" data-comparison-menu hidden>Native object comparison · Connection graphics, not a compiled electrical netlist.</p>
+<main class="workspace"><section class="pane"><h2 data-comparison-menu hidden>Original <span id="old-name"></span></h2><div id="old-surface" class="surface" tabindex="0" aria-label="Original schematic"></div></section><section class="pane"><h2 data-comparison-menu hidden>Modified <span id="new-name"></span></h2><div id="new-surface" class="surface" tabindex="0" aria-label="Modified schematic"></div></section><aside id="comparison-changes" data-comparison-menu hidden><div class="change-controls"><label for="filter">Changes</label><select id="filter"><option value="all">All</option><option value="added">Added</option><option value="removed">Removed</option><option value="modified">Modified</option><option value="moved">Moved</option></select><button id="previous" aria-label="Previous change">↑</button><button id="next" aria-label="Next change">↓</button></div><nav id="changes" aria-label="Schematic changes"></nav><pre id="details" aria-live="polite"></pre></aside></main>
 <output id="state" class="loading" role="status">Loading comparison…</output></body></html>
diff --git a/frontend/compare.js b/frontend/compare.js
index 9f64476..565af79 100644
--- a/frontend/compare.js
+++ b/frontend/compare.js
@@ -1,11 +1,14 @@
 import { bindCamera } from './interactions.js';
 const menuToggle=document.querySelector('#menu-toggle');
+const menuPanels=document.querySelectorAll('[data-comparison-menu]');
 function setMenu(open){
+  for(const panel of menuPanels)panel.hidden=!open;
   document.body.classList.toggle('menu-open',open);
   menuToggle.setAttribute('aria-expanded',String(open));
   const label=open?'Hide menu':'Show menu';
   menuToggle.setAttribute('aria-label',label);menuToggle.title=label;
 }
+setMenu(false);
 menuToggle.addEventListener('click',()=>setMenu(!document.body.classList.contains('menu-open')));
 addEventListener('keydown',event=>{
   if(event.key==='Escape'&&document.body.classList.contains('menu-open')){