Under select Span from the dropdown menu. macOS Open System Settings and go to Wallpaper .
: Provides high-resolution, artistic photography that works well for spanning. Many images are 4K or higher, which you can crop to your 2304x864 requirement. 2304x864 Two Screen Wallpaper">
: Similar to Unsplash, this offers free stock photos with landscapes and abstract designs that are often wide enough for dual monitors. Under select Span from the dropdown menu