Major new feature for @NotebookLM power users: in the tradition of Mind Maps, Notebook can now auto-label your sources, making it much easier to manage notebooks with many sources. I’ve been using it for weeks and it is amazingly versatile with big notebooks. Details below. Here’s how it works. If you have more than 5 sources in a Notebook, you’ll see a new “auto-label” button above the source list on the left side. Click on that and Notebook will review the content of all your sources and organize them into high-level categories. Each source can have multiple labels if there is overlap in the subject matter. Once the labels have been applied, you’ll see a new tidy view of your sources where you see only the top level categories, but you can easily expand to see all the sources associated with each label. Click the three dot menu next to each to rename or delete the label. (Sources won’t be deleted.) Or add emojis to visually differentiate between labels. You can click the three dot menu next to each source to assign different labels to the source. Having that organized label view in the source panel makes it much easier to find a specific source you’re looking for, but that’s just the beginning. You can also focus the AI on specific categories using the selection buttons on the right hand of the source panel. Select one category and all the responses in chat will be grounded exclusively in the sources assigned to that label. This can be helpful if you’re worried about the AI getting distracted by information in other categories, and it can speed up your chat response times because there are fewer sources to load into the context. Selecting by label is also super helpful for generating studio artifacts. If you want a podcast focused only the sources about the civil war in your American History notebook, just select that label and click the audio overview button in Studio. Label view also greatly enhances Fast and Deep Research in a notebook with many existing sources. In the past, if one of the research agents added a batch of sources (up to 40 or 50 with Deep Research) all the sources would be scattered through your source panel alphabetically with no way to tell which ones were the new additions. But now, if all your pre-existing sources are neatly filed away in the appropriate labels, when you pull down new research sources they all appear in alphabetical list below the label categories. That makes it easy to review those new sources to see which ones you really want to keep, and you can manually select them (and de-select all the labels) to explore the new information you’ve just added to your notebook. Let’s say you want to add new information specifically about the Battle Of Gettysburg to your American History notebook—run a Fast Research query, import ten new sources, select those new unlabelled sources and hit the Slide Deck button to do a focused review of the history of Gettysburg. Once you’ve explored those new sources, you can always hit the original auto-label button in the top left and choose “Reorganize unlabeled sources.” Notebook will automatically assign the appropriate labels to the new arrivals. If you want to switch back to the full alphabetical list of sources, just choose “Return to list view” to return to the traditional source panel layout. Notebook will remember your labels so it's easy to switch back and forth between the two views. The feature should be rolling out to all users over the next few days. Enjoy!