only in patch2:
unchanged:
--- a/core/themes/bartik/css/style.css
+++ b/core/themes/bartik/css/style.css
@@ -1858,11 +1858,6 @@ div.add-or-remove-shortcuts {
 }
 
 /* Configuration. */
-div.admin .right,
-div.admin .left {
-  width: 49%;
-  margin: 0;
-}
 div.admin-panel {
   background: #fbfbfb;
   border: 1px solid #ccc;
only in patch2:
unchanged:
--- a/core/themes/seven/css/components/admin-panel.css
+++ b/core/themes/seven/css/components/admin-panel.css
@@ -1,13 +1,6 @@
 /**
  * Admin panel.
  */
-@media screen and (min-width: 40em) {
-  div.admin .right,
-  div.admin .left {
-    width: 49%;
-    margin: 0;
-  }
-}
 div.admin-panel,
 div.admin-panel .body {
   padding: 0;