Solidworks 2025 sp4.1 visualize background issue

Hi all, i've got an issue with solidworks 2025 fully upto date, when I try and change the color of the background in visualize as per the following image (taken from an online guide) - background color is highlighted in the image.png

 

I click the elongated white colour section and the left hand swatch to change the color is meant to show up. On my install this doesn't happen and i've got no way to change the color. I think this also happened on previous versions also. Has anyone got a workaround?