Audience Library is built to help marketers to manage and create audiences from different media platforms in a single place. This approach offers a scaleable combination of first-party and third-party audiences to target with precision in every campaign, on every platform.
The audience listing screen helps you filter the saved audiences based on the Brand and Ad Platform along with the audience sizing and the source of the audiences. Instructions to create your first audience in this article
Looking for more help? Instructions to reach out to support are here.