Labeling in Azure AI Content Understanding Studio

Azure Content Understanding recently went to GA and one of the new ways to use it with GA API is the Content Understanding Studio. According to the documentation, it's also the only offering that supports in-context learning with data labeling https://learn.microsoft.com/en-us/azure/ai-services/content-understanding/foundry-vs-content-understanding-studio

I tried Content Understanding Studio with some test PDF invoices, and this worked fine, but I cannot see any options for labeling. In the Content Understanding Preview in the classic Foundry there was a tab specifically for labeling, but in the new Studio Site with the GA API, I can't find anything comparable.

The tutorial for Content Understanding Studio clearly also describes that labeling is possible

https://learn.microsoft.com/en-us/azure/ai-services/content-understanding/how-to/customize-analyzer-content-understanding-studio?tabs=portal

I got to step 9, but I cannot figure out what I need to do in step 10 to get it working.

Optional step: In-context learning (documents only): To further improve the quality of the output of your schema, you have the option to enable in-context learning. This step will enable you to bring in a knowledge base of data for the model to reference and learn from. To get started, you will need to upload your training data to a blob storage account. Select the “Knowledge” tab and select the blob storage container containing the training dataset of sample documents. Based on the analyzer you just defined, the model will assign labels to your document. Validate that training data by reviewing and correcting any labels that have provided an incorrect output, or add any missing output.

I had to connect a blob account when I created the project in the Studio and the test data I'm uploading via UI appears in the storage, but I don't see a knowledge tab anywhere nor do I see anything, be it an option or a tab, with "in-context learning" or labeling.

So how does labeling actually work with Content Understanding Studio?