The Main Preview showing as Magenta/Pink usually means that the graph Target is not supported in the current Render Pipeline. This can be found under the Graph Settings tab of the Graph Inspector window - which you can toggle with a button in the top right of the graph. If you have created a “Blank Shader Graph” you would also need to add a target to that list before you can use the graph on a material. In 2021.2+ it is possible to add the Built-in RP as a target. Older verisons do not have support for Built-in and must use URP or HDRP. Once the URP or HDRP package is installed, there is more that is required to properly configure Unity to use those pipelines, such as assigning a pipeline asset under Project Settings. See the documentation for steps (can select version in top left of these pages) : URP : Install URP into a Project HDRP : Upgrading to HDRP If you have already done this, check the Target (under the Graph Settings tab of the Graph Inspector window). Make sure this matches the the pipeline you have installed & configured. Then save the graph using the Save Asset button in the top left. May be able to find more information in my Intro to Shader Graph post. Note that you may also see other previews showing as Magenta/Pink when obtaining undefined values (NAN), such as when dividing by zero, or using negative values in the Power node (as the hlsl pow function only supports positive ranges).