Oddbean new post about | logout
 It's apparently automatically set on upgrade. Apple Accessibility Support walked me through disabling it, but it was their first time with this case and things may change.
1) For Screen Saver, choose one of the Other ones.
2) On the same settings pane, turn off Show on All Spaces
3) For Wallpaper, if it's not your preferred wallpaper then choose that or anything that doesn't have an icon on it.