Index: wp-admin/css/wp-admin.dev.css
===================================================================
--- wp-admin/css/wp-admin.dev.css	(revision 20778)
+++ wp-admin/css/wp-admin.dev.css	(working copy)
@@ -5303,6 +5303,10 @@
 	border-right: 1px solid rgba( 0, 0, 0, 0.2 );
 }
 
+.wp-full-overlay.collapsed .wp-full-overlay-sidebar {
+	overflow: visible;
+}
+
 .wp-full-overlay-main {
 	position: fixed;
 	left: 300px;