Press Windows + I to open Settings. In the Settings window, choose Personalization on the left, then Background on the right. Select the Personalize Your Background dropdown, and then choose Solid Color. Choose a color from the preset palette or select the View Colors button to use a custom color picker.

To apply a solid color on the Windows 11 desktop, use these steps: Open Settings. Click on Personalization. Click the Background page on the right side. Source: Windows Central (Image credit: Source: Windows Central) Under the "Personalize your background" setting, select the Solid color option. Select a background color.

Select Start > Settings > Personalization > Background. In the list next to Personalize your background, select Picture, Solid color, or Slideshow.