luminosity changes the brightness of the screen.
 

settings reset resets all the parameters in settings to their default factory values.
  

clear user presets deletes all midi config presets in the user bank.

clear factory presets deletes all midi config presets in the factory bank.

factory reset resets the Osmose CE firmware to its factory state without any presets installed. Use OsmoseUpdater’s Advanced Mode -> “push factory collection” to reinstall factory presets.