But I'm still curious on what Resolve All would do... Any ideas?
When "Sensitive Data Scan" is run during SmartScan and it finds some sensitive documents, you should see documents grouped into several groups when the scan is finished. You can click on each category to see the list of documents (incl. file location) and can easily preview these document to see the content.
Sensitive Data Scan is in Free only in SmartScan, in IS+ it is a separate component with advanced scan and protection layer for these documents. As a standalone component (in IS+) Avast has more time to perform deeper analysis -- in opposite to SmartScan, its scan must finish in 2 minutes and scan only some locations/documents, because SmartScan must be fast, it's not regular FullScan.
Sensitive Data Scan is right now offered only for US country (and 50% user base), we're still translating this module to support other countries (Canada/UK/Brazil/France are already prepared).