Can't run Full Scan. If I choose "Protection" then "Virus Scans" I can only choose "RUN SMART SCAN" or create a Custom Scan.
I think I found the solution after WAY TOO MUCH time on this problem, which should not have been a problem to begin with.
If you hover over "Run Smart Scan" under "Custom Scan," to the far right are three vertical dots. Left click on those dots for a pull-down menu and select Settings.
From there, you can change the "scan name" to whatever you want it to be.
Then click on "scan type" and select "Full Virus Scan."
Set your frequency and time, and any of the other options to your preference.
Click "Back" at the top left, and you should now have a full custom scan set up as a daily scan (or your frequency of choice).
To test if the "Smart Scan" would show up again as a relentless default, I disabled Avast by unchecking "Enable Self-Defense" and then ended the Avast process via Task Manager. I then restarted Avast, and my "Full Virus Scan" remained exactly as I set it up to be. I then re-enabled "Enable Self-Defense" again.
I have not rebooted my system (which I will do in the morning), to see if the settings stay put as I set them, or if that single "Full Virus Scan" custom scan reverts back to "Smart Scan" as a relentless default.
If it does revert back, I will post again. But for now, the full daily scan kicked in as it was supposed to, as I set it up an hour before the full virus scan time "I" wanted it to scan at.
FYI: If you check under the main window of "Virus Scans" while the scan is running, you will see that the Custom Scan to the far right is active while the scan is in progress. The "Full Virus Scan" option to the far left will not show activity as it used to be in previous versions.