diff --git a/Makefile b/Makefile
index 160a02b..56cee6b 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ build:  ## Build the devbrain binary at the repo root (version from VERSION)
 
 test:  ## Go vet + full test suite, plus dashboard regression when Node is available
 	@scripts/test-guard.sh $(GOTESTFLAGS)
-	@if command -v node >/dev/null 2>&1; then node scripts/test-dashboard-concurrency.mjs; else echo "dashboard regression skipped (node unavailable)"; fi
+	@if command -v node >/dev/null 2>&1; then node scripts/test-dashboard-concurrency.mjs && node scripts/test-dashboard-brain-menu.mjs; else echo "dashboard regression skipped (node unavailable)"; fi
 
 release:  ## Manual fallback — CI releases on tag push (.github/workflows/release.yml)
 	GITHUB_TOKEN=$${GITHUB_TOKEN:-$$(gh auth token)} sh -c '\
diff --git a/VERSION b/VERSION
index 5b5dc42..f93a854 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.5.26
+1.5.27
diff --git a/assets/dashboard.css b/assets/dashboard.css
index 32850d9..5a1aaae 100644
--- a/assets/dashboard.css
+++ b/assets/dashboard.css
@@ -402,10 +402,19 @@ body.dragsel #moon{transform:scale(1.1)}            /* moon grows during a drag
 }
 
 [hidden]{display:none!important}
-.brain-controls,#brain-buttons{display:flex;align-items:center;gap:5px;flex-wrap:wrap}
-.brain-controls>span{color:var(--muted);font-size:11px}
-#brain-buttons button{font-size:12px;padding:5px 9px;color:var(--muted)}
-#brain-buttons button[aria-pressed=true]{color:var(--text);border-color:var(--accent);background:rgba(10,132,255,.18)}
+.brain-controls{position:relative;flex:none}
+.brain-controls>summary{display:flex;align-items:center;gap:6px;padding:6px 8px;min-height:32px;list-style:none;cursor:pointer;color:var(--muted);font-size:12px;border-radius:6px}
+.brain-controls>summary::-webkit-details-marker{display:none}
+.brain-controls>summary::after{content:"";width:5px;height:5px;border-right:1px solid;border-bottom:1px solid;transform:translateY(-2px) rotate(45deg)}
+.brain-controls>summary:hover,.brain-controls[open]>summary{background:var(--panel);color:var(--text)}
+#brain-count:empty{display:none}
+#brain-count{font-variant-numeric:tabular-nums;color:var(--text)}
+#brain-buttons{position:absolute;top:calc(100% + 6px);right:0;min-width:180px;max-width:calc(100vw - 32px);padding:4px;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 6px 18px rgba(0,0,0,.3)}
+#brain-buttons button{display:flex;align-items:center;gap:9px;width:100%;padding:8px;text-align:left;font-size:13px;background:transparent;border:0;border-radius:4px;overflow-wrap:anywhere}
+#brain-buttons button:hover{background:var(--line)}
+#brain-buttons button:disabled{opacity:.5;cursor:not-allowed}
+.brain-check{display:inline-flex;align-items:center;justify-content:center;flex:none;width:15px;height:15px;border:1px solid var(--muted);border-radius:3px;font-size:11px}
+[aria-pressed=true]>.brain-check{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
 #brain-error{padding:12px 16px;border-bottom:2px solid var(--accent);background:var(--panel);font-weight:600}
 #pf-prefs-brain{max-width:160px;font-size:11px;padding:3px 6px}
-@media(max-width:640px){.brain-controls{width:100%;order:5}#pf-prefs-brain{max-width:110px}}
+@media(max-width:640px){.brain-controls>summary,#brain-buttons button{min-height:44px}#pf-prefs-brain{max-width:110px}}
diff --git a/assets/dashboard.html b/assets/dashboard.html
index b98e683..f726fc0 100644
--- a/assets/dashboard.html
+++ b/assets/dashboard.html
@@ -9,7 +9,7 @@
     <button data-view="profile" class="active">📊 Profile</button>
     <button data-view="monitor" id="viewMonitorBtn" style="display:none">🌙 Nightshift</button>
   </div>
-  <div id="brain-controls" class="brain-controls" role="group" aria-label="Brains" hidden><span>Brains</span><div id="brain-buttons"></div></div>
+  <details id="brain-controls" class="brain-controls" hidden><summary>Brains<span id="brain-count"></span></summary><div id="brain-buttons" role="group" aria-label="Visible Brains"></div></details>
   <span class="sp"></span>
   <div class="search"><input id="search" placeholder="Search tasks, PRs, authors…" aria-label="Search"><kbd>⌘K</kbd></div>
   <select id="filterProject" aria-label="Project filter"><option value="">all projects</option></select>
diff --git a/assets/dashboard.js b/assets/dashboard.js
index 4477ea0..3d20a44 100644
--- a/assets/dashboard.js
+++ b/assets/dashboard.js
@@ -20,8 +20,13 @@ function brainNotice(message=''){
   $('#brain-error').textContent=text; $('#brain-error').hidden=!text;
 }
 function renderBrainButtons(){
+  const focused=$('#brain-buttons').contains(document.activeElement)?document.activeElement.dataset.brain:null;
   $('#brain-controls').hidden=BRAINS.length<2;
-  $('#brain-buttons').innerHTML=BRAINS.map(b=>`<button type="button" data-brain="${esc(b.name)}" aria-pressed="${!HIDDEN_BRAINS.has(b.name)}" ${window.preferencesEditing?'disabled':''} title="${b.available?'Include '+esc(brainLabel(b.name))+' in this view':'Brain unavailable'}">${HIDDEN_BRAINS.has(b.name)?'○':'✓'} ${esc(brainLabel(b.name))}${b.available?'':' · Unavailable'}</button>`).join('');
+  const count=selectedBrains().length;
+  $('#brain-count').textContent=count===BRAINS.length?'':`${count}/${BRAINS.length}`;
+  $('#brain-controls summary').title=count===BRAINS.length?'All Brains Shown':`${count} of ${BRAINS.length} Brains Shown`;
+  $('#brain-buttons').innerHTML=BRAINS.map(b=>`<button type="button" data-brain="${esc(b.name)}" aria-pressed="${!HIDDEN_BRAINS.has(b.name)}" ${window.preferencesEditing?'disabled':''} title="${b.available?'Include '+esc(brainLabel(b.name))+' in this view':'Brain unavailable'}"><span class="brain-check" aria-hidden="true">${HIDDEN_BRAINS.has(b.name)?'':'✓'}</span>${esc(brainLabel(b.name))}${b.available?'':' · Unavailable'}</button>`).join('');
+  if(focused) [...$('#brain-buttons').querySelectorAll('button')].find(b=>b.dataset.brain===focused)?.focus();
   $('#brain-buttons').querySelectorAll('button').forEach(b=>b.onclick=()=>{
     if(window.preferencesEditing) return;
     if(HIDDEN_BRAINS.has(b.dataset.brain)) HIDDEN_BRAINS.delete(b.dataset.brain); else HIDDEN_BRAINS.add(b.dataset.brain);
@@ -31,6 +36,12 @@ function renderBrainButtons(){
     DATA.tasks=DATA.tasks.filter(brainIncluded); NS.runs=NS.runs.filter(brainIncluded); render(); if(VIEW==='monitor') renderMonitor(); load(); checkNS();
   });
 }
+document.addEventListener('click',e=>{if(!e.composedPath().includes($('#brain-controls'))) $('#brain-controls').open=false;});
+document.addEventListener('keydown',e=>{
+  if(e.key==='Escape' && $('#brain-controls').open){
+    $('#brain-controls').open=false; $('#brain-controls summary').focus();
+  }
+});
 const BRAINS_READY=(async()=>{
   const response=await fetch('/api/brains'); if(!response.ok) throw new Error('Could not load brains');
   BRAINS=(await response.json()).brains; renderBrainButtons(); brainNotice();
diff --git a/scripts/test-dashboard-brain-menu.mjs b/scripts/test-dashboard-brain-menu.mjs
new file mode 100644
index 0000000..15db9a9
--- /dev/null
+++ b/scripts/test-dashboard-brain-menu.mjs
@@ -0,0 +1,26 @@
+import assert from 'node:assert/strict';
+import {readFileSync} from 'node:fs';
+import vm from 'node:vm';
+
+const source=readFileSync(new URL('../assets/dashboard.js',import.meta.url),'utf8');
+const start=source.indexOf("document.addEventListener('click'");
+const end=source.indexOf('const BRAINS_READY=',start);
+assert.ok(start>=0 && end>start);
+const handlers={}, menu={open:true,contains:()=>false};
+let focused=false;
+vm.runInNewContext(source.slice(start,end),{
+  document:{addEventListener:(event,handler)=>handlers[event]=handler},
+  $:selector=>selector==='#brain-controls'?menu:{focus:()=>{focused=true;}},
+});
+
+// Selecting a brain replaces the clicked button before the event reaches document.
+handlers.click({target:{},composedPath:()=>[{},menu,{}]});
+assert.equal(menu.open,true,'Selecting a brain must leave the menu open');
+handlers.click({target:{},composedPath:()=>[{}]});
+assert.equal(menu.open,false,'Clicking outside must close the menu');
+menu.open=true;
+handlers.keydown({key:'Tab'});
+assert.equal(menu.open,true);
+handlers.keydown({key:'Escape'});
+assert.equal(menu.open,false);
+assert.equal(focused,true,'Escape must return focus to the menu trigger');