Index: wp-includes/css/media-views.css
===================================================================
--- wp-includes/css/media-views.css	(revision 23020)
+++ wp-includes/css/media-views.css	(working copy)
@@ -259,6 +259,11 @@
 	float: right;
 }
 
+.media-sidebar .setting input[type="checkbox"] {
+	width: auto;
+	float: none;
+}
+
 .media-sidebar .setting textarea,
 .compat-item .field textarea {
 	height: 62px;