Resolve "Collapsed open and closed sections in boards styling is broken"

app/assets/stylesheets/pages/boards.scss

@@ -136,15 +136,23 @@
       right: 0;
       bottom: 0;
       left: 0;
+
+      button {
+        display: none;
+      }
     }
 
     .board-title {
       padding: 0;
       border-bottom: 0;
+      justify-content: center;
 
       > span {
+        width: 100%;
+        margin-top: -12px;
         display: block;
-        transform: rotate(90deg) translate(35px, 10px);
+        transform: rotate(90deg) translate(35px, 0);
+        overflow: initial;
       }
     }
 

changelogs/unreleased/51050-fix.yml

+---
+title: Fix broken styling when issue board is collapsed
+merge_request: 21868
+author: Andrea Leone
+type: fixed