What is the most precise way to prevent external users from accessing sensitive documents within a SharePoint Online document library, even if they have a sharing link?

The most precise way to prevent external users from accessing sensitive documents within a SharePoint Online document library, even if they possess a sharing link, is to revoke their access directly or implement stricter access controls. First, you can specifically remove the external user's permissions from the document or library. This can be done by going to 'Manage Access' for the document or library and removing the individual external user's entry....