Okay, I found an AvastUI, but it doesn't look like yours:
You have to follow the path I gave from first opening the AvastUI (user interface) at the bottom is the settings option.
Change the
settings in the AvastUI > Components > Mail Shield > Customise > Behaviour - General and uncheck the 'Insert note into' options.
Or to be clearer AvastUI >
Settings > Components > Mail Shield > Customise > Behaviour - General and uncheck the 'Insert note into' options.
See extract from your image with the Settings marked