Backport - Shader Graph's New Nodes Preview option description

Author: sebastienduverne

Packages/com.unity.shadergraph/Documentation~/Shader-Graph-Preferences.md

@@ -15,6 +15,7 @@ Use the Shader Graph preferences to define shader graph settings for your system
 | **Zoom Step Size**                           | Adjusts how much the Shader Graph camera zooms with each mouse wheel movement. This helps balance zoom speed, since touchpads can zoom much faster than regular mouse wheels.<br/>Only affects materials created automatically, such as when you make a new shader graph from a Decal Projector or Fullscreen Renderer Feature.                                                                                                                                                                                                                                                                                                                                                                                       |
 | **Graph Template Workflow**                  | Sets whether Unity creates new materials as [material variants](https://docs.unity3d.com/Manual/materialvariant-concept.html) from the child asset of the shader graph asset, or as standalone materials. The options are: <ul><li>**Material Variant**: Unity creates material variants from the child asset of the shader graph asset.</li><li>**Material**: Unity creates standalone materials.</li></ul> |
 | **Open new Shader Graphs automatically** | Makes Unity open the Shader Graph window immediately after you create a new shader graph asset. When disabled, Unity does not open the window, and you must open the graph manually. |
+| **New Nodes Preview** | Makes Shader Graph automatically expand the preview area for any newly created node that supports previews. When disabled, Shader Graph does not expand previews, but you can expand them manually. |
 
 ## Additional resources