diff --git a/web/src/styles/app.css b/web/src/styles/app.css
index 644d479..ab5daea 100644
--- a/web/src/styles/app.css
+++ b/web/src/styles/app.css
@@ -1679,8 +1679,11 @@ select optgroup { background-color: var(--bg-elev); color: var(--fg); }
    one that is open. The panel is positioned against the layout rather than the
    scrolling content, so it stays put while the list scrolls under it.
    ========================================================================== */
-.admin-layout { position: relative; }
-.admin-content { max-width: 960px; }
+/* One column: the section list is in the folder pane (AdminNav), so the
+   table gets the width a second column would take. The height and scrolling
+   are what .settings-layout gave it. */
+.admin-layout { position: relative; height: 100%; min-height: 0; flex: 1; display: flex; flex-direction: column; }
+.admin-content { max-width: 1120px; flex: 1; min-height: 0; }
 .admin-head { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
 .admin-head .grow { min-width: 220px; }
 .admin-toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
diff --git a/web/src/views/AppShell.tsx b/web/src/views/AppShell.tsx
index 396ad75..b5f169e 100644
--- a/web/src/views/AppShell.tsx
+++ b/web/src/views/AppShell.tsx
@@ -23,6 +23,7 @@ import { TranslateBoundary } from "@/ui/TranslateBoundary";
 import { t } from "@/lib/i18n";
 import { hasAdministration } from "@/lib/adminAccess";
 import { usePermissions } from "./admin/usePermissions";
+import { AdminNav } from "./admin/AdminNav";
 
 const PUSH_LABEL = {
   connected: "Live updates connected",
@@ -213,7 +214,7 @@ export function AppShell({ children }: { children: ReactNode }) {
             {section === "contacts" && <ContactsSidebar />}
             {section === "files" && <FilesTree />}
             {section === "settings" && <div className="nav-section"><span>{t("Settings")}</span></div>}
-            {section === "admin" && <div className="nav-section"><span>{t("Administration")}</span></div>}
+            {section === "admin" && <AdminNav />}
           </div>
           {(section === "mail" || section === "search") && <QuotaBar />}
           <nav className="module-bar" aria-label={t("Go to")}>
diff --git a/web/src/views/admin/AdminNav.tsx b/web/src/views/admin/AdminNav.tsx
new file mode 100644
index 0000000..b3d0bd5
--- /dev/null
+++ b/web/src/views/admin/AdminNav.tsx
@@ -0,0 +1,48 @@
+import type { ReactNode } from "react";
+import { Link, useLocation } from "wouter";
+import { Globe, User } from "lucide-react";
+import { adminSections, type AdminSection } from "@/lib/adminAccess";
+import { t } from "@/lib/i18n";
+import { usePermissions } from "./usePermissions";
+
+export const ADMIN_SECTIONS: Record<AdminSection, { group: string; label: string; icon: ReactNode }> = {
+  accounts: { group: "Directory", label: "Accounts", icon: <User size={20} /> },
+  domains: { group: "Mail", label: "Domains", icon: <Globe size={20} /> },
+};
+
+/** The section the address names, or the first the role can open. */
+export function currentAdminSection(allowed: AdminSection[], requested: string | undefined): AdminSection | undefined {
+  return allowed.find((s) => s === requested) ?? allowed[0];
+}
+
+/**
+ * Administration's sections, in the folder pane.
+ *
+ * Settings keeps its list inside the page; Administration's pages are tables
+ * that want the width, so the list lives where Mail keeps its folders. On a
+ * phone that puts it in the drawer, which is where every other section's list
+ * already is. Only sections the role can read are listed.
+ */
+export function AdminNav() {
+  const [location] = useLocation();
+  const allowed = adminSections(usePermissions());
+  const current = currentAdminSection(allowed, location.split("/")[2]);
+  const groups = [...new Set(allowed.map((s) => ADMIN_SECTIONS[s].group))];
+  return (
+    <nav aria-label={t("Administration")}>
+      {groups.map((group) => (
+        <div key={group}>
+          <div className="nav-section"><span>{t(group)}</span></div>
+          {allowed
+            .filter((s) => ADMIN_SECTIONS[s].group === group)
+            .map((s) => (
+              <Link key={s} href={`/admin/${s}`} className={`nav-item ${current === s ? "active" : ""}`} title={t(ADMIN_SECTIONS[s].label)} aria-current={current === s ? "page" : undefined}>
+                {ADMIN_SECTIONS[s].icon}
+                <span className="nav-label">{t(ADMIN_SECTIONS[s].label)}</span>
+              </Link>
+            ))}
+        </div>
+      ))}
+    </nav>
+  );
+}
diff --git a/web/src/views/admin/AdminView.tsx b/web/src/views/admin/AdminView.tsx
index 567554d..f8f4abc 100644
--- a/web/src/views/admin/AdminView.tsx
+++ b/web/src/views/admin/AdminView.tsx
@@ -1,57 +1,33 @@
 import type { ReactNode } from "react";
-import { Link, Redirect, useLocation } from "wouter";
-import { ArrowLeft, Globe, User } from "lucide-react";
+import { Redirect } from "wouter";
 import { adminSections, type AdminSection } from "@/lib/adminAccess";
-import { t } from "@/lib/i18n";
 import { AccountsAdmin } from "./AccountsAdmin";
 import { DomainsAdmin } from "./DomainsAdmin";
+import { currentAdminSection } from "./AdminNav";
 import { usePermissions } from "./usePermissions";
 
-const SECTIONS: Record<AdminSection, { group: string; label: string; icon: ReactNode; render: (id?: string) => ReactNode }> = {
-  accounts: { group: "Directory", label: "Accounts", icon: <User size={18} />, render: (id) => <AccountsAdmin selectedId={id} /> },
-  domains: { group: "Mail", label: "Domains", icon: <Globe size={18} />, render: (id) => <DomainsAdmin selectedId={id} /> },
+const RENDER: Record<AdminSection, (id?: string) => ReactNode> = {
+  accounts: (id) => <AccountsAdmin selectedId={id} />,
+  domains: (id) => <DomainsAdmin selectedId={id} />,
 };
 
 /**
  * Administration: what the signed-in account's Stalwart role lets it manage.
  *
- * Laid out like Settings, because it is the same kind of place -- a list of
- * sections and the one that is open -- and on a phone it behaves the same way,
- * the list first and a section on its own. Only the sections the role can read
- * are listed; a section typed into the address bar that it cannot read opens
- * the first one it can.
+ * The page is only the open section. Its list of sections is in the folder
+ * pane (see AdminNav), so the tables here get the width Settings spends on a
+ * second column. A section the role cannot read -- typed into the address bar,
+ * say -- opens the first one it can.
  */
 export function AdminView({ section, id }: { section?: string; id?: string }) {
-  const [, navigate] = useLocation();
   const allowed = adminSections(usePermissions());
-  // Typed in by hand, or a role taken away since the menu was drawn. Stalwart
-  // would refuse every call anyway; this spares the page of refusals.
+  // A role taken away since the menu was drawn. Stalwart would refuse every
+  // call anyway; this spares the page of refusals.
   if (!allowed.length) return <Redirect to="/mail" />;
-  const current = allowed.find((s) => s === section) ?? allowed[0]!;
-  const groups = [...new Set(allowed.map((s) => SECTIONS[s].group))];
+  const current = currentAdminSection(allowed, section)!;
   return (
-    <div className={`settings-layout admin-layout ${section ? "section" : "root"}`}>
-      <nav className="settings-nav" aria-label={t("Administration")}>
-        {groups.map((group) => (
-          <div key={group}>
-            <div className="nav-section" style={{ paddingLeft: 8 }}><span>{t(group)}</span></div>
-            {allowed.filter((s) => SECTIONS[s].group === group).map((s) => (
-              <Link key={s} href={`/admin/${s}`} className={`nav-item ${current === s ? "active" : ""}`}>
-                {SECTIONS[s].icon}
-                <span className="nav-label">{t(SECTIONS[s].label)}</span>
-              </Link>
-            ))}
-          </div>
-        ))}
-      </nav>
-      <div className="settings-content admin-content">
-        {section && (
-          <button className="btn btn-ghost btn-sm admin-back" style={{ marginBottom: 8, marginLeft: -8 }} onClick={() => navigate("/admin")}>
-            <ArrowLeft size={16} /> {t("Administration")}
-          </button>
-        )}
-        {SECTIONS[current].render(section === current ? id : undefined)}
-      </div>
+    <div className="admin-layout">
+      <div className="settings-content admin-content">{RENDER[current](section === current ? id : undefined)}</div>
     </div>
   );
 }
diff --git a/web/src/views/admin/__tests__/admin-nav.test.tsx b/web/src/views/admin/__tests__/admin-nav.test.tsx
new file mode 100644
index 0000000..dbd03d7
--- /dev/null
+++ b/web/src/views/admin/__tests__/admin-nav.test.tsx
@@ -0,0 +1,54 @@
+import { act } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { Router } from "wouter";
+import { memoryLocation } from "wouter/memory-location";
+import { useSession } from "@/store/session";
+import type { JmapSession } from "@/jmap/types";
+import { AdminNav } from "../AdminNav";
+
+(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+
+const signIn = (permissions: string[]) =>
+  useSession.setState({ session: { capabilities: {}, accounts: {}, primaryAccounts: {}, username: "a@example.com", ihasmail: { permissions } } as unknown as JmapSession });
+
+/** The folder pane's list of Administration sections: only what the role can read. */
+describe("the Administration list in the folder pane", () => {
+  let host: HTMLDivElement;
+  let root: Root;
+  const render = async (path: string) => {
+    const { hook } = memoryLocation({ path });
+    await act(async () => {
+      root.render(<Router hook={hook}><AdminNav /></Router>);
+    });
+  };
+  beforeEach(() => {
+    host = document.createElement("div");
+    document.body.appendChild(host);
+    root = createRoot(host);
+  });
+  afterEach(async () => {
+    await act(async () => root.unmount());
+    host.remove();
+  });
+
+  it("lists each readable section under its group and marks the open one", async () => {
+    signIn(["sysAccountQuery", "sysAccountGet", "sysDomainQuery", "sysDomainGet"]);
+    await render("/admin/domains/d1");
+    expect([...host.querySelectorAll(".nav-section")].map((e) => e.textContent)).toEqual(["Directory", "Mail"]);
+    expect(host.querySelector(".nav-item.active")?.textContent).toBe("Domains");
+  });
+
+  it("treats a bare /admin as the first section, which is what the page opens", async () => {
+    signIn(["sysAccountQuery", "sysAccountGet", "sysDomainQuery", "sysDomainGet"]);
+    await render("/admin");
+    expect(host.querySelector(".nav-item.active")?.textContent).toBe("Accounts");
+  });
+
+  it("leaves out what the role cannot read", async () => {
+    signIn(["sysDomainQuery", "sysDomainGet"]);
+    await render("/admin");
+    expect(host.textContent).not.toContain("Accounts");
+    expect(host.querySelector(".nav-item.active")?.textContent).toBe("Domains");
+  });
+});