We've greatly improved the Sanity Studio experience for working with many features, including documents that are exported by different features.
This change gives you a more organized view of your features, allowing you to explore things easily. It keeps the system documents (like routes, conditional-routes, categories, and regions) in one place, which are quickly reachable, and also documents which are feature-specific, organized according to features.
We think the overall experience makes it easier to scale your projects across multiple features.