Hi @Jano Thanks for waiting! Could you please try this version of the Screeneo Colour Adjustment app? If you go further below the RGB settings you will find options to load/save the settings into two user slots. Let me know if this helps.
Remember that colour settings are reset to the hardcoded values when plugging/unplugging the charger, or changing the brightness mode from the Settings app. You’ll need to return to the Colour Adjustment app and load one of your own settings in this case.