Black background

how to have the background black or any other color than white

With one of the standard styles:
menu Window > Styles > Edit > Background Settings (third icon) > change the background to black and uncheck ‘Sky’ and ‘Ground’.

wonderfull thanks for your prompt help

And for that - and other - settings to become the basis of your default SU model setting, create a file with your preferences you want to see then go to File > Save as Template. Tick the box to make that your default. Of course, you can change templates at will from Window > Preferences > Template.

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