Index: wp-includes/css/media-views.css
===================================================================
--- wp-includes/css/media-views.css	(revision 22717)
+++ wp-includes/css/media-views.css	(working copy)
@@ -211,6 +211,10 @@
 	margin-right: 4%;
 }
 
+.media-sidebar .setting select {
+	max-width: 65%;
+}
+
 .media-sidebar .setting span,
 .compat-item label span {
 	float: left;