Bootscan

Sometimes when Avast detects a malware, it offers to run a bootscan.
Is there an option to disable this i.e not offer to run bootscan?

Simply say no if you don’t want it to run.

Can the boot scan be cancelled mid way?

avast FAQ https://www.avast.com/en-eu/faq.php
FAQ videos https://www.avast.com/en-eu/faq.php?q=video#searchForm