https://www.bleepingcomputer.com/news/microsoft/microsoft-testing-memberships-subscription-section-in-windows-10-store-app/

Microsoft has just started rolling out the new search experience in the Windows 10 App Store on Insider Builds and it comes with a new search category called "Memberships". The new category centralizes all available memberships and offers a way for users to quickly find them and cancel them.

At the moment, the category is only showing the Xbox Game Pass subscription but it's likely that other memberships add-ins will be added soon. To browse the available subscriptions, you would need to join the Release Preview Ring, update the Microsoft Store to the latest version, and search "Xbox" to see the membership category on the left sidebar.