diff --git a/build/media_source/templates/atum/js/template.es6.js b/build/media_source/templates/atum/js/template.es6.js
index daa664b1d9807..9a699591258cd 100644
--- a/build/media_source/templates/atum/js/template.es6.js
+++ b/build/media_source/templates/atum/js/template.es6.js
@@ -10,7 +10,6 @@
 
   const mobile = window.matchMedia('(max-width: 992px)');
   const small = window.matchMedia('(max-width: 575.98px)');
-  const smallLandscape = window.matchMedia('(max-width: 767.98px)');
   const tablet = window.matchMedia('(min-width: 576px) and (max-width:991.98px)');
 
   /**
@@ -210,12 +209,12 @@
       wrapper.classList.add('closed');
     }
 
-    if (smallLandscape.matches) {
-      if (sidebarNav) sidebarNav.classList.add('mm-collapse');
-      if (subhead) subhead.classList.add('mm-collapse');
+    if (small.matches) {
+      if (sidebarNav) sidebarNav.classList.add('collapse');
+      if (subhead) subhead.classList.add('collapse');
     } else {
-      if (sidebarNav) sidebarNav.classList.remove('mm-collapse');
-      if (subhead) subhead.classList.remove('mm-collapse');
+      if (sidebarNav) sidebarNav.classList.remove('collapse');
+      if (subhead) subhead.classList.remove('collapse');
     }
   }