The NOT so Smart Scan used to have section in the main Avast settings and that actually allowed to do what you seek.
However, that has long gone, now you have to go into the geek:area via the Menu > Settings > Search and type geek:area, and scroll down, see attached images. Even then there is no selection of which scans you want.
Your image is just the Avast Components, the smart scan isn't a component but part of the avast protection
I'm sure I have probably mentioned it before, but the smart scan to me is more of a vehicle to promote other avast paid products and this Advanced issues is the main element.
I abandoned the NOT so Smart Scan ages ago, and only run what scan I feel are worth my time (as resident scanners make on-demand scan much depreciated), That would be the very occasional WiFi Inspector and possibly the Software Updater, which incidentally has been temporally removed from the smart scan), but still available as a manually run on-demand scan.