diff --git a/apps/client/package.json b/apps/client/package.json
index de8ec26..1d91008 100644
--- a/apps/client/package.json
+++ b/apps/client/package.json
@@ -16,7 +16,7 @@
     "check:prettier": "prettier --check .",
     "fix:prettier": "prettier --write .",
     "typecheck": "tsc --noEmit",
-    "test:botsu": "node --experimental-strip-types --test src/botsu/apps/catalog.test.ts src/botsu/apps/launcher.test.ts src/botsu/profile/summary.test.ts src/botsu/presence/connection-generation.test.ts src/botsu/presence/cursor-publisher.test.ts src/botsu/presence/cursor-state.test.ts src/botsu/presence/socket-message.test.ts src/botsu/presence/state.test.ts",
+    "test:botsu": "node --experimental-strip-types --test src/botsu/apps/catalog.test.ts src/botsu/apps/launcher.test.ts src/botsu/profile/summary.test.ts src/botsu/presence/compact-presence.test.ts src/botsu/presence/connection-generation.test.ts src/botsu/presence/cursor-publisher.test.ts src/botsu/presence/cursor-state.test.ts src/botsu/presence/socket-message.test.ts src/botsu/presence/state.test.ts src/botsu/shell/layout.test.ts",
     "typecheck:botsu": "../../node_modules/.bin/tsc -p tsconfig.botsu.json && ../../node_modules/.bin/tsc -p tsconfig.botsu-ui.json",
     "prepare": "husky install",
     "commit": "git-cz",
diff --git a/apps/client/src/botsu/presence/BotsuPresence.tsx b/apps/client/src/botsu/presence/BotsuPresence.tsx
index 18f3e5c..6e46028 100644
--- a/apps/client/src/botsu/presence/BotsuPresence.tsx
+++ b/apps/client/src/botsu/presence/BotsuPresence.tsx
@@ -19,6 +19,7 @@ import {
   type RemoteCursorState,
 } from './cursor-state';
 import { createPresenceWebSocketUrl, parsePresenceSocketMessage } from './socket-message';
+import { createCompactPresence } from './compact-presence';
 
 const getInitials = (displayName: string): string =>
   displayName
@@ -178,6 +179,7 @@ export function BotsuPresence() {
     () => projectVisibleRemoteCursors(remoteCursors, state.participants, location.pathname),
     [location.pathname, remoteCursors, state.participants]
   );
+  const compactPresence = useMemo(() => createCompactPresence(participants, 4), [participants]);
 
   const statusLabel = {
     connecting: 'Connexion…',
@@ -196,13 +198,19 @@ export function BotsuPresence() {
         </div>
         {participants.length > 0 && (
           <ul aria-label="Membres présents">
-            {participants.map((participant) => {
+            {participants.map((participant, index) => {
               const avatarUrl = participant.avatarUrl
                 ? mxcUrlToHttp(mx, participant.avatarUrl, useAuthentication, 48, 48, 'crop') ??
                   undefined
                 : undefined;
               return (
-                <li key={participant.userId} title={participant.userId}>
+                <li
+                  className={
+                    index >= compactPresence.visible.length ? 'botsu-visually-hidden' : undefined
+                  }
+                  key={participant.userId}
+                  title={`${participant.displayName} (${participant.userId})`}
+                >
                   <span className="botsu-presence-avatar" aria-hidden="true">
                     {avatarUrl ? (
                       <img src={avatarUrl} alt="" />
@@ -210,10 +218,15 @@ export function BotsuPresence() {
                       getInitials(participant.displayName)
                     )}
                   </span>
-                  <span>{participant.displayName}</span>
+                  <span className="botsu-visually-hidden">{participant.displayName}</span>
                 </li>
               );
             })}
+            {compactPresence.hiddenCount > 0 && (
+              <li className="botsu-presence-overflow" aria-hidden="true">
+                +{compactPresence.hiddenCount}
+              </li>
+            )}
           </ul>
         )}
       </aside>
diff --git a/apps/client/src/botsu/presence/compact-presence.test.ts b/apps/client/src/botsu/presence/compact-presence.test.ts
new file mode 100644
index 0000000..ed188a0
--- /dev/null
+++ b/apps/client/src/botsu/presence/compact-presence.test.ts
@@ -0,0 +1,23 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createCompactPresence } from './compact-presence.ts';
+
+const participants = ['Ada', 'Bob', 'Chloé', 'Dina', 'Eli'].map((displayName, index) => ({
+  userId: `@member${index}:botsu.net`,
+  displayName,
+}));
+
+test('compact presence keeps four members visible and counts the remainder', () => {
+  const compact = createCompactPresence(participants, 4);
+
+  assert.deepEqual(
+    compact.visible.map((participant) => participant.displayName),
+    ['Ada', 'Bob', 'Chloé', 'Dina']
+  );
+  assert.equal(compact.hiddenCount, 1);
+  assert.equal(compact.totalCount, 5);
+});
+
+test('compact presence rejects an invalid visible member limit', () => {
+  assert.throws(() => createCompactPresence(participants, 0), /positive integer/);
+});
diff --git a/apps/client/src/botsu/presence/compact-presence.ts b/apps/client/src/botsu/presence/compact-presence.ts
new file mode 100644
index 0000000..b0e163b
--- /dev/null
+++ b/apps/client/src/botsu/presence/compact-presence.ts
@@ -0,0 +1,20 @@
+export type CompactPresence<T> = {
+  visible: readonly T[];
+  hiddenCount: number;
+  totalCount: number;
+};
+
+export const createCompactPresence = <T>(
+  participants: readonly T[],
+  visibleLimit: number
+): CompactPresence<T> => {
+  if (!Number.isInteger(visibleLimit) || visibleLimit < 1) {
+    throw new RangeError('visibleLimit must be a positive integer');
+  }
+
+  return {
+    visible: participants.slice(0, visibleLimit),
+    hiddenCount: Math.max(0, participants.length - visibleLimit),
+    totalCount: participants.length,
+  };
+};
diff --git a/apps/client/src/botsu/shell/layout.test.ts b/apps/client/src/botsu/shell/layout.test.ts
new file mode 100644
index 0000000..805bb7b
--- /dev/null
+++ b/apps/client/src/botsu/shell/layout.test.ts
@@ -0,0 +1,20 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import test from 'node:test';
+
+const shellCssUrl = new URL('./shell.css', import.meta.url);
+
+const getRuleBody = (css: string, selector: string): string => {
+  const escapedSelector = selector.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+  const match = css.match(new RegExp(`${escapedSelector}\\s*\\{([^}]*)\\}`));
+  assert.ok(match, `Missing CSS rule for ${selector}`);
+  return match[1];
+};
+
+test('BOTSU shell leaves room for the active call footer', async () => {
+  const css = await readFile(shellCssUrl, 'utf8');
+  const shellRule = getRuleBody(css, '.botsu-shell');
+
+  assert.match(shellRule, /height:\s*100%;/);
+  assert.doesNotMatch(shellRule, /height:\s*100dvh;/);
+});
diff --git a/apps/client/src/botsu/shell/shell.css b/apps/client/src/botsu/shell/shell.css
index 5bb386d..1ec39df 100644
--- a/apps/client/src/botsu/shell/shell.css
+++ b/apps/client/src/botsu/shell/shell.css
@@ -1,7 +1,7 @@
 .botsu-shell {
   width: 100%;
   min-width: 0;
-  height: 100dvh;
+  height: 100%;
   overflow: auto;
   color: var(--botsu-color-text);
   background-color: var(--botsu-color-canvas);
@@ -183,7 +183,7 @@
 .botsu-presence ul {
   display: flex;
   justify-content: flex-end;
-  gap: 0.3rem;
+  gap: 0;
   margin: 0;
   padding: 0;
   list-style: none;
@@ -192,10 +192,13 @@
 .botsu-presence li {
   display: flex;
   align-items: center;
-  gap: 0.3rem;
   font-size: 0.68rem;
 }
 
+.botsu-presence li + li {
+  margin-left: -0.35rem;
+}
+
 .botsu-presence-avatar {
   width: 1.5rem;
   height: 1.5rem;
@@ -215,6 +218,31 @@
   object-fit: cover;
 }
 
+.botsu-presence-overflow {
+  min-width: 1.5rem;
+  height: 1.5rem;
+  justify-content: center;
+  color: var(--botsu-color-text);
+  background: var(--botsu-color-surface);
+  border: var(--botsu-border-width) solid var(--botsu-color-border);
+  border-radius: 999px;
+  font-family: ui-monospace, monospace;
+  font-size: 0.58rem;
+  font-weight: 800;
+}
+
+.botsu-visually-hidden {
+  position: absolute !important;
+  width: 1px !important;
+  height: 1px !important;
+  padding: 0 !important;
+  margin: -1px !important;
+  overflow: hidden !important;
+  clip: rect(0, 0, 0, 0) !important;
+  white-space: nowrap !important;
+  border: 0 !important;
+}
+
 .botsu-remote-cursors {
   position: fixed;
   inset: 0;