On Microsoft Quick Assist's Privacy Page you can request and collect all the privacy and GDPR related information that Microsoft Quick Assist is providing.
The privacy policy by is a legal document or statement that discloses how Microsoft Quick Assist gathers, uses, discloses, and manges their customers' data.
The basis for Microsoft sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.