In System Settings -> Desktop Behavior -> Activities there is Privacy tab. But it doesn't seem to work, because when "I chose Do not remember", applications remembers their history.
screenshots: https://drive.google.com/open?id=1J7...XWCPf_iLJNxNe0
screenshots: https://drive.google.com/open?id=1J7...XWCPf_iLJNxNe0
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