diff --git a/plugins/webmail_plugin_labels/webmail_plugin_labels/ui/sidebar.js b/plugins/webmail_plugin_labels/webmail_plugin_labels/ui/sidebar.js
index 2ada133..81e534b 100644
--- a/plugins/webmail_plugin_labels/webmail_plugin_labels/ui/sidebar.js
+++ b/plugins/webmail_plugin_labels/webmail_plugin_labels/ui/sidebar.js
@@ -110,6 +110,10 @@ export default function mount(el, ctx) {
     if (!name) { adding = null; render(); return; }
     await ctx.api.pluginFetch("/labels", { method: "POST", body: JSON.stringify({ name }) });
     adding = null;
+    // Creating a label while the section is collapsed would hide the thing you
+    // just made, so open it — and remember that, the way the chevron does.
+    collapsed = false;
+    try { localStorage.setItem("labels.collapsed", "0"); } catch { /* ignore */ }
     window.dispatchEvent(new Event("webmail:labels-changed"));
   }