app/assets/stylesheets/spree/backend/components/_messages.scss in solidus_backend-2.10.0.beta1 vs app/assets/stylesheets/spree/backend/components/_messages.scss in solidus_backend-2.10.0

@@ -28,9 +28,13 @@
   position: fixed;
   bottom: 0;
   left: $width-sidebar;
   right: 0;
   z-index: 1000;
+
+  .admin-nav-hidden & {
+    left: $width-sidebar-collapsed;
+  }
 }
 
 .flash {
   border-top: 3px solid;
   padding: 16px;