When the Smart Scan is scheduled to run weekly, every week when it runs, a new window appears with the progress and status, along with a new entry on the task bar. This is seriously intrusive, so I had to disable the Smart Scan to avoid Avast causing any periodic disruption of work. Some people probably don’t care and already accept random pop-ups from various other random apps, but it’s just wrong, and I want to point out that you should add a way to disable these disruptions. We should have the right to run a periodic test that is silent unless it results in any error.
You may be better creating a custom scan and running that periodically.
Some users avoid Smart Scan, or at least stop it running automatically on a schedule.
Smart scan will tend to flag errors, alerts and be intrusive, as a means of upselling other Avast products.
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Uhm, I just saw a Custom Scan launch an intrusive pop-up in the corner. It’s just like Smart Scan, so why did you say it’s better? Avast developers, do you ever plan to add an option for silent tests please?
And if anyone asks, obviously, a completely silent mode is absolutely unacceptable, because it’s vital to be able to see actual alerts.
You don’t mention what you have that custom scan do, as that like the smart scan may find something which it feels you could do with a paid option to resolve 
Personally, I feel that with a resident (on-access) scanner the need for on-demand scans (Smart or otherwise) is much depreciated. For the most part dormant/inert files are being scanned, the other active files are going to be scanned by the resident shields when they are activated.