I use Avast Antivirus Pro 17.2.2288
I was messing around in the scan parameters of the full scan preset.
I deleted all the scan areas from it.
What are the default settings for scan areas in correct order for the full scan?
I, too, went into Settings under Custom Scans and found what you’ve posted as the scan area.
If you’ve deleted all full scan settings (you’ve not said how you did that) the quickest and surest way back to a fully functioning a/v program is to do a Repair of avast. Program and Features>select Avast>choose repair
If that does not work you’ll need to do a clean install.
Backing up your settings before making changes: (see attached below)
In Troubleshooting, you can reset “Program settings (including default scans)”. This means you will lose any customizations you have done.