Mark supervised users in the "Users" list in about:settings.

chrome/browser/resources/options/browser_options.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 #change-home-page-section {
   margin-left: 30px;
 }
 
 #home-page-url {
   display: inline-block;
@@ skipping 69 matching lines @@
 
 #sync-buttons {
   clear: both;
 }
 
 #profiles-list {
   margin-bottom: 10px;
   min-height: 0;
 }
 
+#profiles-list .profile-container {
+  -webkit-box-align: center;
+  display: -webkit-box;
+  max-width: 100%;
+}
+
 #profiles-list .profile-name {
   -webkit-box-flex: 1;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
+#profiles-list .profile-supervised {
+  color: #999;
+  margin-left: 5px;
+}
+
 #profiles-list > * {
   height: 40px;
 }
 
 #profiles-list:focus {
   border-color: rgb(77, 144, 254);
 }
 
 .profile-img {
   height: 31px;
@@ skipping 315 matching lines @@
 }
 
 #accessibility-autoclick .controlled-setting-with-label {
   -webkit-box-align: baseline;
 }
 
 #accessibility-autoclick label + select {
   /* Same as .controlled-setting-with-label > input + span. */
   -webkit-margin-start: 0.6em;
 }