Newbe question on changing background color when Daz first opens

Hello,
When I first start daz it use to have a llight gray or black background and somehow I did something so that now when it opens it has a white background. Can anyone give me guidance on how to turn it back to black. Note I am not loading figures or scenes, just starting daz.
Thank you
Comments
Window>Style>Customise Style and change the colour in 6. Viewports
If you have accidenttaly changed the style settings you can reset it by going to Window->Style->Select style and then picking the one you want. Alternatively, Windows->Style->Customise and then you can change the colours directly.
Thank you both