MacOS Big Sur 11.3: Change desktop background image for all desktops

If you just want the solution, it’s at the very bottom of this article. Introduction In MacOS Big Sur 11.3, it has now gotten harder to update the desktop background for all MacOS desktops in one operation. 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. Read more