In Slice mode, don't instantiate the handler, and also hide and disable the breadcrumbs widgets.

Signed-off-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

Code/Editor/ViewportTitleDlg.cpp

@@ -15,6 +15,7 @@
 #include "ViewportTitleDlg.h"
 
 // Qt
+#include <QLabel>
 #include <QInputDialog>
 
 #include <AtomLyIntegration/AtomViewportDisplayInfo/AtomViewportInfoDisplayBus.h>
@@ -38,6 +39,7 @@
 
 #include <AzCore/std/algorithm.h>
 #include <AzCore/Casting/numeric_cast.h>
+#include <AzFramework/API/ApplicationAPI.h>
 #include <AzToolsFramework/Viewport/ViewportMessages.h>
 
 #include <LmbrCentral/Audio/AudioSystemComponentBus.h>
@@ -145,6 +147,11 @@ CViewportTitleDlg::~CViewportTitleDlg()
     AZ::VR::VREventBus::Handler::BusDisconnect();
     GetISystem()->GetISystemEventDispatcher()->RemoveListener(this);
     GetIEditor()->UnregisterNotifyListener(this);
+
+    if (m_prefabViewportFocusPathHandler)
+    {
+        delete m_prefabViewportFocusPathHandler;
+    }
 }
 
 void CViewportTitleDlg::SetupCameraDropdownMenu()
@@ -312,7 +319,22 @@ void CViewportTitleDlg::OnInitDialog()
 
     m_cameraSpeed->setFixedWidth(width);
 
-    m_prefabViewportFocusPathHandler.Initialize(m_ui->m_prefabFocusPath, m_ui->m_prefabFocusBackButton);
+    bool isPrefabSystemEnabled = false;
+    AzFramework::ApplicationRequests::Bus::BroadcastResult(isPrefabSystemEnabled, &AzFramework::ApplicationRequests::IsPrefabSystemEnabled);
+
+    if (isPrefabSystemEnabled)
+    {
+        m_prefabViewportFocusPathHandler = new AzToolsFramework::Prefab::PrefabViewportFocusPathHandler();
+        m_prefabViewportFocusPathHandler->Initialize(m_ui->m_prefabFocusPath, m_ui->m_prefabFocusBackButton);
+    }
+    else
+    {
+        m_ui->m_prefabFocusPath->setEnabled(false);
+        m_ui->m_prefabFocusBackButton->setEnabled(false);
+        m_ui->m_prefabFocusPath->hide();
+        m_ui->m_prefabFocusBackButton->hide();
+    }
+    
 }
 
 //////////////////////////////////////////////////////////////////////////

Code/Editor/ViewportTitleDlg.h

@@ -177,7 +177,7 @@ protected:
     QWidgetAction* m_gridSizeActionWidget = nullptr;
     QWidgetAction* m_angleSizeActionWidget = nullptr;
 
-    AzToolsFramework::Prefab::PrefabViewportFocusPathHandler m_prefabViewportFocusPathHandler;
+    AzToolsFramework::Prefab::PrefabViewportFocusPathHandler* m_prefabViewportFocusPathHandler = nullptr;
 
     QScopedPointer<Ui::ViewportTitleDlg> m_ui;
 };