A unified data governance solution that helps manage, protect, and discover data across your organization
Unfortunately this is a known limitation/gap with the new experience. Many others have complained about the same, but thus far we haven't received any commitment from Microsoft with regards to the de-duplication feature. Best thing to do here is leave your feedback over at the Purview feedback portal: https://feedback.azure.com/d365community/forum/82d7bddb-fb24-ec11-b6e6-000d3a4f07b8