OK first off, some things you really need to understand:

1: We don’t work for Avast. We’re just users like yourself, trying to help each other.
2: I did read your entire posts and I don’t appreciate the tone of your comments.

When I go to my Avast Free, these (see picture) are my options under ‘Protection’, and right at the top is ‘Smart Scan’.

I’ve never set up a scheduled smart scan, so for this screenshot I’ve set it from manual to monthly, and as you can see, you can customize date and time.
This, if I remember correctly from when it happend to me, is also the date and time when the Smart Scan runs that Avast had enabled without user consent. I set it back to manual.

This is not the same menu as when you create a custom scan. This menu exists even if you’ve never created a custom scan.