It's now there again. Must have been updated yesterday, since I didn't change the config file like recommended above.
Anyway I wonder how they will fit in the old settings into the new settings when they remove, as they mentioned, the old settings in version 20.3 or 20.4.
The geek area seems promising, since I was not aware it exists. I tried now it but it seems also a little bit buggy. The search doesn't work there and if I close the geek area and try to open the settings again, the settings indeed open but without content and Avast freezes so I have to close the window over the taskbar and open the Avast window again