Smart Cleaning is not enabled. CCleaner is not set to run when computer starts. Still though, after closing CCleaner, it remains running in the System Tray.
Windows 10 Version 2004 OS build 19041.610
Hi markfleener, there is a bug here.
If you don't want Smart Cleaning enabled, uncheck all checkboxes on that screen and then switch off 'automatic updates' on the Update screen. We'll patch it in the next day or so.