ENGCOM-5321: Fixed 23230 : Sticky header floating under top when there is no buttons in the toolbar #23247

 - Merge Pull Request #23247 from konarshankar07/magento2:2.3-develop
 - Merged commits:
   1. ce56c70
   2. f5a93b7
   3. a3fa8d1

Author: magento-engcom-team

app/code/Magento/Ui/view/base/web/js/grid/toolbar.js

@@ -271,7 +271,10 @@ define([
          */
         show: function () {
             this.visible = true;
-
+            //Check admin grid button has addedr not
+            if ($('.page-main-actions').length === 0) {
+                this.$sticky.style.top = 0;
+            }
             this.$sticky.style.display = '';
             this.$toolbar.style.visibility = 'hidden';