You can change the desktop background color in Windows 11 by replacing your wallpaper picture with a single solid color. The setting lives in the personalization options of Settings. It takes only a few clicks and you can switch back to a picture at any time.
- Open Settings → Personalization, open the desktop background page, choose the single-color option and pick a color.
- To undo it, return to the same page and choose the picture option again, then select an image.
- The Colors page changes accent colors and light or dark mode, not the desktop background color.