This is one area Avast needs to work on.
There's currently no way to see the logs via the UI. They should be able to incorporate the log information into the UI with the relevant info. Then there's also the stats which always keep getting pushed...
That's the problem with the change to using the Notifications Area, once the information is removed/cleared there is no easy way to look back at the detections, etc.
God don't get us started on Stats - they have been dead/non-existent for so long it is hard to say when - first they were removed to be improved. Yet still no improvement, this is the kind of short sightedness remove a function, before you have its improved replacement. Anything is possibly better than nothing at all.
This isn't the only feature/function that has gone absent. Unfortunately the same can't be said with some of the junk that has been placed in an AV. Avast are pushing to monetize the free version, but placing paid features in the UI in the hope they will persuade people to buy. Even running scans by these features/functions and reporting issues that can be resolved without paying (CleanUp, Sensitive Data Shield, Ransomware Shield, etc).