diff --git a/administrator/templates/atum/index.php b/administrator/templates/atum/index.php
index d8fcead7e9e0a..c4245252bb7b1 100644
--- a/administrator/templates/atum/index.php
+++ b/administrator/templates/atum/index.php
@@ -137,13 +137,13 @@
 	<?php endif; ?>
 
 	<?php // container-fluid ?>
-	<div class="container-fluid container-main">
+	<div class="container-fluid container-main" id="main-container">
 		<?php if (!$cpanel) : ?>
 			<?php // Subheader ?>
-			<button class="navbar-toggler toggler-toolbar toggler-burger collapsed" type="button" data-toggle="collapse" data-target=".subhead" aria-controls="subhead" aria-expanded="false" aria-label="<?php echo Text::_('TPL_ATUM_TOOLBAR'); ?>">
+			<button class="navbar-toggler toggler-toolbar toggler-burger" type="button" data-toggle="collapse" data-target=".subhead" aria-controls="subhead" aria-expanded="false" aria-label="<?php echo Text::_('TPL_ATUM_TOOLBAR'); ?>">
 				<span class="toggler-toolbar-icon"></span>
 			</button>
-			<div id="subhead" class="subhead mb-3">
+			<div id="subhead" class="subhead mb-3 collapse show">
 				<div id="container-collapse" class="container-collapse"></div>
 				<div class="row">
 					<div class="col-md-12">
diff --git a/build/media_source/templates/atum/js/template.es6.js b/build/media_source/templates/atum/js/template.es6.js
index b2f6a757ec20e..20852f18f229a 100644
--- a/build/media_source/templates/atum/js/template.es6.js
+++ b/build/media_source/templates/atum/js/template.es6.js
@@ -236,7 +236,15 @@
    * @since   4.0.0
    */
   function reactToResize() {
+    const toolbar = doc.getElementById('main-container');
     window.addEventListener('resize', () => {
+      if (window.innerWidth >= 576) {
+        if (toolbar && !toolbar.querySelector('#subhead').classList.contains('show')) {
+          toolbar.querySelector('#subhead').classList.add('show');
+          toolbar.querySelector('.toggler-toolbar').setAttribute('aria-expanded', 'true');
+          toolbar.querySelector('.toggler-toolbar').classList.remove('collapsed');
+        }
+      }
       if (mobile.matches) {
         setMobile();
       } else {