1.12.10

New since 1.12.8 (same signing key: installs over 1.12.8, no uninstall needed; reboot after updating).

Main switch at the top of the module's settings ("Module enabled"). Off: the monitor goes back to mirroring, the phone screen and the dock go back to normal, and every hook lets HyperOS behave as stock, without a reboot and without touching LSPosed. Desktop mode is fully stock again after reconnecting the monitor or rebooting. The Monitor tile and the diagnostics line show when the module is off.
New option "Don't open HyperOS's own desktop on the monitor" (Dock section, off by default). Keeps the stock Xiaomi desktop (SecondaryDisplayLauncher) off the monitor and closes it if it is already open. Try it if the phone's gestures stop working after you change the monitor's density or scale. The dock and your apps are not affected.
Simplified Chinese translation.

Thanks to @oldbkroll, whose fork had the first version of these three ideas.