diff --git a/scripts/sandbox/nginx-develop.conf b/scripts/sandbox/nginx-develop.conf
index e44f547a9..f11dc67e5 100644
--- a/scripts/sandbox/nginx-develop.conf
+++ b/scripts/sandbox/nginx-develop.conf
@@ -89,8 +89,13 @@ server {
         #
         # sub_filter_once is ON. It applies PER STRING, and with it off this
         # panel appeared four times - once for every <form> on the page.
+        #
+        # Anchored on the login form BY ID. Anchored on a bare <form it landed
+        # inside the first form of every page this box serves - the ordering
+        # page's assistant, once that grew a composer - and the owner asked
+        # why customers were being shown staff logins.
         sub_filter_once on;
-        sub_filter '<form' '<!--email_off--><div style="max-width:520px;margin:0 auto 18px;padding:12px 14px;border:1px solid #cfd9ea;border-radius:8px;background:#f5f8fc;color:#1f2937;font:13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;text-align:left"><div style="font-weight:600;margin-bottom:7px">Demo logins <span style="font-weight:400;color:#5b6473">&mdash; password <code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">Develop@123</code> for all four</span></div><table style="border-collapse:collapse;font-size:13px"><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Admin</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">admin@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">everything</td></tr><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Manager</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">manager@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">no staff or branch admin</td></tr><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Cashier</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">cashier@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">the till</td></tr><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Staff</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">staff@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">least access</td></tr></table></div><!--/email_off--><form';
+        sub_filter '<form id="login_form"' '<!--email_off--><div style="max-width:520px;margin:0 auto 18px;padding:12px 14px;border:1px solid #cfd9ea;border-radius:8px;background:#f5f8fc;color:#1f2937;font:13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;text-align:left"><div style="font-weight:600;margin-bottom:7px">Demo logins <span style="font-weight:400;color:#5b6473">&mdash; password <code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">Develop@123</code> for all four</span></div><table style="border-collapse:collapse;font-size:13px"><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Admin</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">admin@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">everything</td></tr><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Manager</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">manager@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">no staff or branch admin</td></tr><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Cashier</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">cashier@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">the till</td></tr><tr><td style="padding:3px 10px 3px 0;white-space:nowrap"><b>Staff</b></td><td style="padding:3px 10px 3px 0"><code style="background:#fff;border:1px solid #dbe3f0;border-radius:4px;padding:1px 5px;font-size:12px">staff@develop.posnic.io</code></td><td style="padding:3px 0;color:#5b6473;white-space:nowrap">least access</td></tr></table></div><!--/email_off--><form id="login_form"';
 
         # A mark on the right edge rather than a bar across the bottom: the
         # bar sat on top of every page's own bottom bar (the ordering page's