FiftyOne 0.19 has been released with new features that enhance visualization of computer vision datasets and improve machine learning model performance. These features include Spaces, which allows users to organize panels of information within the FiftyOne App; In-App Embeddings Visualization, enabling direct visualization of embeddings in the App through a panel made possible by Spaces; Saved views, allowing users to save views under a name and recall them later; On-disk segmentations, which lets users store semantic segmentation masks and heatmaps on disk; and new UI filtering options. These features aim to streamline annotation workflows, identify and correct labeling mistakes, and analyze model performance.