added chevron to AddRandomizerMenu directory label

com.unity.perception/Editor/Randomization/Uss/AddRandomizerMenuStyles.uss

 .chevron-right {
     height: 12px;
     width: 12px;
-    background-image: resource("Packages/com.unity.perception/Editor/Randomization/Icons/FoldoutClosed.png");
+    background-image: resource("Packages/com.unity.perception/Editor/Randomization/Icons/ChevronRight.png");
+}
+
+.chevron-left {
+    height: 12px;
+    width: 12px;
+    background-image: resource("Packages/com.unity.perception/Editor/Randomization/Icons/ChevronLeft.png");
 }
 
 .menu-element:hover {

com.unity.perception/Editor/Randomization/Uxml/Randomizer/AddRandomizerMenu.uxml

-<UXML xmlns="UnityEngine.UIElements" xmlns:editor="UnityEditor.UIElements">
+<UXML xmlns="UnityEngine.UIElements">
-        <TextElement name="directory-name" text="Randomizers" style="-unity-text-align: middle-center; -unity-font-style: bold; padding: 3px; background-color: #414141; border-bottom-width: 1px; border-top-width: 1px;border-color: #232323;"/>
+        <VisualElement name="directory-label" style="flex-direction: row; justify-content: space-between; align-items: center; background-color: #414141">
+            <VisualElement name="directory-chevron" class="chevron-left"/>
+            <TextElement name="directory-label-text" text="Randomizers" style="-unity-font-style: bold; padding: 3px;"/>
+            <VisualElement/>
+        </VisualElement>
         <VisualElement name="menu-options"/>
     </VisualElement>
 </UXML>

com.unity.perception/Editor/Randomization/VisualElements/Randomizer/AddRandomizerMenu.cs

 {
     class AddRandomizerMenu : VisualElement
     {
+        const string k_DefaultDirectoryText = "Randomizers";
         string m_CurrentPath = string.Empty;
         string currentPath
         {
             get
             {
                 if (m_CurrentPath == string.Empty)
-                    return "Randomizers";
+                    return k_DefaultDirectoryText;
                 var pathItems = m_CurrentPath.Split('/');
                 return pathItems[pathItems.Length - 1];
             }
                     DrawDirectoryItems();
                 else
                     DrawSearchItems();
+            }
+        }
+
+        string directoryText
+        {
+            set
+            {
+                m_DirectoryLabelText.text = value;
+                m_DirectoryChevron.style.visibility = value == k_DefaultDirectoryText
+                    ? new StyleEnum<Visibility>(Visibility.Hidden)
+                    : new StyleEnum<Visibility>(Visibility.Visible);
-        TextElement m_DirectoryName;
+        TextElement m_DirectoryLabelText;
+        VisualElement m_DirectoryChevron;
         Dictionary<string, List<MenuItem>> m_MenuItemsMap = new Dictionary<string, List<MenuItem>>();
         Dictionary<string, HashSet<string>> m_MenuDirectories = new Dictionary<string, HashSet<string>>();
         List<MenuItem> m_MenuItems = new List<MenuItem>();
                     ExitMenu();
             });
 
-            m_DirectoryName = this.Q<TextElement>("directory-name");
-            m_DirectoryName.RegisterCallback<MouseUpEvent>(evt => { AscendDirectory(); });
+            var directoryLabel = this.Q<VisualElement>("directory-label");
+            directoryLabel.RegisterCallback<MouseUpEvent>(evt => { AscendDirectory(); });
+            m_DirectoryLabelText = this.Q<TextElement>("directory-label-text");
+            m_DirectoryChevron = this.Q<VisualElement>("directory-chevron");
 
             var searchBar = this.Q<TextField>("search-bar");
             searchBar.schedule.Execute(() => searchBar.ElementAt(0).Focus());
 
         void DrawDirectoryItems()
         {
-            m_DirectoryName.text = currentPathName;
+            directoryText = currentPathName;
             m_MenuElements.Clear();
 
             if (m_MenuDirectories.ContainsKey(currentPath))
 
         void DrawSearchItems()
         {
-            m_DirectoryName.text = "Randomizers";
+            directoryText = k_DefaultDirectoryText;
             m_MenuElements.Clear();
 
             var upperSearchString = searchString.ToUpper();

com.unity.perception/Editor/Randomization/VisualElements/Randomizer/RandomizerElement.cs

 using UnityEditor;
 using UnityEditor.UIElements;
 using UnityEngine.Experimental.Perception.Randomization.Editor;
-using UnityEngine.Experimental.Perception.Randomization.Randomizers;
 using UnityEngine.UIElements;
 
 namespace UnityEngine.Experimental.Perception.Randomization.VisualElements
         SerializedProperty m_Property;
         VisualElement m_PropertiesContainer;
 
-        Randomizer randomizer => (Randomizer)StaticData.GetManagedReferenceValue(m_Property);
+        Randomizers.Randomizer randomizer => (Randomizers.Randomizer)StaticData.GetManagedReferenceValue(m_Property);
 
         public Type randomizerType => randomizer.GetType();
 

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