Firmware update - manual needs updating

I received a Boox yesterday as a gift. The first thing I did was install the firmware update. I was looking at the user manual for how to change my lock screen to behave more like an eReader but the manual tells me that in order to change the screen saver/power off screen, "In Home Screen, go to Settings > Desktop & Screensaver > Screensaver"

There is no Desktop & Screensaver option on the Settings screen, and I have been unable to locate it in any of the likely screen options. Please advise.