Subscription signage now makes it clear, everywhere in the product, which subscription your current workspace belongs to. The subscription name appears directly on the workspace selection button, so you can tell where you're working without having to dig for it.
Open the workspace selection modal and you'll see workspaces grouped under subscription-name dividers, with every workspace you have access to listed beneath its subscription. If you have access across multiple subscriptions, those boundaries are now visible instead of implied.
Workspace creation also adds a confirmation step. A checkbox now asks you to acknowledge that the new workspace is being created under the subscription you're currently in. It's a small bit of friction, but it prevents workspaces from landing in the wrong place.