diff --git a/frontend/packages/dashboard/src/flow.js b/frontend/packages/dashboard/src/flow.js
index 2d4de8a4..b89cd78d 100644
--- a/frontend/packages/dashboard/src/flow.js
+++ b/frontend/packages/dashboard/src/flow.js
@@ -353,10 +353,12 @@ import { epochSec } from "./util.js";
     }
     function updateSuggest() {
       const v = input.value;
-      // Only suggest when an @-token sits at the very start of the
-      // input — switching recipient is always "redirect this whole
-      // line." Mid-message @-mentions stay literal.
-      const m = v.match(/^@(\S*)/);
+      // Only suggest while the cursor is still inside the @-token at the
+      // very start of the input — switching recipient is always "redirect
+      // this whole line." Once whitespace follows the token the recipient
+      // is chosen: the list must close, or it swallows the Enter that
+      // should send. Mid-message @-mentions stay literal.
+      const m = v.match(/^@(\S*)$/);
       if (!m) {
         hideSuggest();
         return;