The image you posted was an image before you start a scan.
The scan is still running. Here's a video: https://streamable.com/pvgz7
I have the same problem, started a scan and stopped it as suggested but still Avast keeps hammering the disk drives using 50% also in task manager says avast installer in operation so i cant even uninstall it. Ill try to disable it from start up if possible. Anyway I hope you are all well other than the stop button that doesn't stop anything
