“Set the wallpaper for Desktop 1, delete all other desktops, then recreate them.AppleScript to tell every desktop to change its image 3.Make the preference panel visible in all desktops, then switch through each desktop and click the same image.Set the image in the preference panel in one desktop, then drag the panel to the other desktops via Mission Control.
Previously you could work around this in a few ways (solutions from Stack Exchange): MacOS provides a way to set the desktop background image for the current desktop, but it doesn’t provide a way to set the background image for all desktops, there is no “Apply Image to All Desktops” button. In MacOS Big Sur 11.3, it has now gotten harder to update the desktop background for all MacOS desktops in one operation.
If you just want the solution, it’s at the very bottom of this article.
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