diff --git a/sksurgeryvtk/widgets/vtk_overlay_window.py b/sksurgeryvtk/widgets/vtk_overlay_window.py
index 336aece..8cc370f 100644
--- a/sksurgeryvtk/widgets/vtk_overlay_window.py
+++ b/sksurgeryvtk/widgets/vtk_overlay_window.py
@@ -93,6 +93,7 @@ def __init__(
         video_in_layer_0=True,  # For backwards compatibility, prior to 3rd Feb 2024.
         video_in_layer_2=False,  # For backwards compatibility, prior to 3rd Feb 2024.
         layer_2_video_mask=None,  # For masking in Layer 3
+        use_depth_peeling=True # Historically, has defaulted to true.
     ):
         """
         Constructs a new VTKOverlayWindow.
@@ -161,10 +162,6 @@ def __init__(
         self.rgba_image_importer.SetDataExtent(self.rgba_image_extent)
         self.rgba_image_importer.SetWholeExtent(self.rgba_image_extent)
 
-        # Enable VTK Depth peeling settings for render window.
-        self.GetRenderWindow().AlphaBitPlanesOn()
-        self.GetRenderWindow().SetMultiSamples(0)
-
         # Five layers used, see class level docstring.
         self.GetRenderWindow().SetNumberOfLayers(5)
 
@@ -183,9 +180,6 @@ def __init__(
         self.layer_1_renderer = vtk.vtkRenderer()
         self.layer_1_renderer.SetLayer(1)
         self.layer_1_renderer.LightFollowCameraOn()
-        self.layer_1_renderer.UseDepthPeelingOn()
-        self.layer_1_renderer.SetMaximumNumberOfPeels(100)
-        self.layer_1_renderer.SetOcclusionRatio(0.1)
 
         # Create and setup layer 2 (masked video) renderer.
         self.layer_2_image_actor = vtk.vtkImageActor()
@@ -202,15 +196,23 @@ def __init__(
         self.layer_3_renderer = vtk.vtkRenderer()
         self.layer_3_renderer.SetLayer(3)
         self.layer_3_renderer.LightFollowCameraOn()
-        self.layer_3_renderer.UseDepthPeelingOn()
-        self.layer_3_renderer.SetMaximumNumberOfPeels(100)
-        self.layer_3_renderer.SetOcclusionRatio(0.1)
 
         # Create and setup layer 4 (Overlay's, like text annotations) renderer.
         self.layer_4_renderer = vtk.vtkRenderer()
         self.layer_4_renderer.SetLayer(4)
         self.layer_4_renderer.LightFollowCameraOn()
 
+        # Enable VTK Depth peeling settings for render window, and renderers.
+        if use_depth_peeling:
+            self.GetRenderWindow().AlphaBitPlanesOn()
+            self.GetRenderWindow().SetMultiSamples(0)
+            self.layer_1_renderer.UseDepthPeelingOn()
+            self.layer_1_renderer.SetMaximumNumberOfPeels(100)
+            self.layer_1_renderer.SetOcclusionRatio(0.1)
+            self.layer_3_renderer.UseDepthPeelingOn()
+            self.layer_3_renderer.SetMaximumNumberOfPeels(100)
+            self.layer_3_renderer.SetOcclusionRatio(0.1)
+
         # Use this to ensure the video is setup correctly at construction.
         self.set_video_image(self.rgb_input)
 
diff --git a/tests/widgets/test_vtk_overlay_window_5_layers.py b/tests/widgets/test_vtk_overlay_window_5_layers.py
index dc6781e..d625b94 100644
--- a/tests/widgets/test_vtk_overlay_window_5_layers.py
+++ b/tests/widgets/test_vtk_overlay_window_5_layers.py
@@ -240,4 +240,4 @@ def test_overlay_window_combined_ar_look(setup_vtk_overlay_window_video_only_lay
 
     # You don't really want this in a unit test, :-)
     # otherwise you can't exit. It's kept here for interactive testing.
-    app.exec()
\ No newline at end of file
+    #app.exec()
\ No newline at end of file