Have you tried a "screen Saver" scan? Or from the UI click "settings", click "silent/gaming" then make your selection.
No need to make it difficult. If you haven't noticed down in the bottom right corner is a "?". Use this for help or more info.
What good is a scan during the screen saver when the screen saver rarely activates? Perhaps you leave your computer for extended periods of time. I'm on mine at all hours of the day at irregular times (partly due to my severe insomnia). It takes time to complete a full deep scan and even if the screen saver activated then it is unlikely the scan will complete (and subsequent scans don't resume from where the prior scan left off). Yes, you (not me) could set the screen saver to an extremely short timeout hoping to catch a couple times a month when it would remain active long enough to complete a scan; however, my screen saver is set to timeout after an hour (and even that may eventually get increased or disabled) because often I am right next to it but busy on another host or with other tasks but then need to be monitoring compiles, edits, or other tasks currently in-progress on this host. Just because I'm not using the keyboard or mouse attached to this host doesn't mean that I'm not using its monitor to watch something.
So your cure is for me to obviate ALL popups by going into silent mode. That also means that I won't be told when I visit malicious web pages or a retrieved file is infected. In that case, why even bother running an antivirus program if I'm not told about the security invasion for which this product was designed? Users don't need to see the info and update popups for the product to properly function. They DO need to see the alert popups regarding malicious pages or behavior or suspicious files; otherwise, there's no point in wasting the disk space and CPU cycles on a completely quiescent program. And, no, I will never let any security product make my decisions for me. I will NOT have Avast automatically quarantine or delete anything. It must ask me what *I* want to do but I only need to make those decisions for the alert popups.
Have YOU read the product's help on just what the silent mode does? Have YOU tested if the popup for a scheduled scan is among those that will NOT display when in silent mode? And do YOU know if the
alert popups still appear when in silent mode?
Since when did informational popups become critical to the behavior of any program? Their informational! While not actually described, there are Info, Update, and Alert popup categories. Update popups are also just info, too. I've been using anti-virus and other security programs for many decades (yeah, I'm that old). Since when is an update anything that has to interrupt a user's use of their host? So Info and Update popups are the same thing: informational popups. And in which popup category would popups for the scheduled scans get classified? It certainly isn't an alert popup.
I mentioned the popup config settings and we got focused there. Those settings may have nothing to do with the dialog window that appears when a scheduled scan begins. I've set the popup timeouts to zero seconds and still the dialog (popup) appears for the scheduled scan. So those popup settings may have no effect on displaying the window for the scheduled scan. Seeing the dialog appear for a scheduled scan may have nothing to do with popups. There is no definition of what popups are included in each category to know if scheduled scans is included in any one of them. It's a new config setting that isn't yet in the help and the config pane for them doesn't describe what is included in each popup category. The new popup settings may be a wild goose chase and instead Avast changed the behavior of scheduled scans to now show a dialog when they begin and which isn't considered a popup.