Hide debug outputs behind a define

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/PreviewManager.cs

                         var results = m_Graph.GetUberPreviewShader();
                         m_OutputIdName = results.outputIdProperty.referenceName;
                         ShaderUtil.UpdateShaderAsset(m_UberShader, results.shader);
+                        #if UNITY_SHADER_GRAPH_DEVMODE
+                        #endif
                         bool uberShaderHasError = false;
                         if (MaterialGraphAsset.ShaderHasError(m_UberShader))
                         {
                     shaderData.shaderString = m_Graph.GetPreviewShader(node).shader;
             }
 
+            #if UNITY_SHADER_GRAPH_DEVMODE
+            #endif
 
             if (string.IsNullOrEmpty(shaderData.shaderString))
             {
             }
 
             // Debug output
+            #if UNITY_SHADER_GRAPH_DEVMODE
+            #endif
             if (MaterialGraphAsset.ShaderHasError(shaderData.shader))
             {
                 shaderData.hasError = true;

MaterialGraphProject/ProjectSettings/ProjectSettings.asset

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+    oculus:
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+      dashSupport: 0
   protectGraphicsMemory: 0
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   APKExpansionFiles: 0
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   StripUnusedMeshComponents: 0
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   tvOSTargetOSVersionString: 9.0
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   appleEnableAutomaticSigning: 0
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+  appleEnableProMotion: 0
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+  templatePackageId: 
+  templateDefaultScene: 
+  AndroidTargetArchitectures: 5
   AndroidSplashScreenScale: 0
   androidSplashScreen: {fileID: 0}
   AndroidKeystoreName: 
   androidGamepadSupportLevel: 0
   resolutionDialogBanner: {fileID: 0}
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+  m_BuildTargetPlatformIcons: []
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     m_EncodingQuality: 1
   - m_BuildTarget: PS4
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   webGLAnalyzeBuildSize: 0
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+  webGLLinkerTarget: 0
-    1: UNITY_POST_PROCESSING_STACK_V2
+    1: UNITY_POST_PROCESSING_STACK_V2;UNITY_SHADER_GRAPH_DEVMODE
     4: UNITY_POST_PROCESSING_STACK_V2
     7: UNITY_POST_PROCESSING_STACK_V2
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     daydream: