Index: src/wp-admin/css/media.css
===================================================================
--- src/wp-admin/css/media.css	(revision 46771)
+++ src/wp-admin/css/media.css	(working copy)
@@ -851,9 +851,16 @@
 
 .wp_attachment_holder .imgedit-wrap .imgedit-panel-content {
 	float: left;
-	padding: 3px 16px 0 0;
+	padding: 3px 16px 20px 0;
 }
 
+@media only screen and (min-width: 783px) {
+	.wp_attachment_holder .imgedit-wrap .imgedit-panel-content {
+		min-width: 400px;
+		max-width: calc( 100% - 266px );
+	}
+}
+
 .wp_attachment_holder .imgedit-wrap .imgedit-settings {
 	float: right;
 	width: 250px;