How can I set the background color of the preview in Niagara to black?
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Hi Bbcool,
In your Niagara Emitter Window. Go to Window → Preview Scene Settings. You can then uncheck ‘Show Environment’ and set the Environment color to black.
At this point if you’d want to hide the grid, you’d do that in the 3d Preview Viewport settings (Show → Grid)
Welcome to the void! 
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Thank you 