.

app/Admin/Controllers/AnnouncementController.php

@@ -23,9 +23,10 @@ class AnnouncementController extends AdminController
             $grid->column('content');
             $grid->column('created_at');
             $grid->disableEditButton();
+            $grid->disableCreateButton();
             $grid->filter(function (Grid\Filter $filter) {
-                $filter->equal('id');
-        
+                $filter->panel();
+                $filter->date('created_at')->datetime()->width(4);
             });
         });
     }