I don't think it exists in the newer firmwares. I'm sure there used to be an option (on my HD3) to add it to key mappings or gestures when using the default PocketBook reader app, but I can no longer see a corresponding option.
FYI you can still disable the touchscreen within KOReader. I have KOReader configured to have top corner presses set to touchscreen and DarkMode as on/off toggles.
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