Internal applications often suffer from complexity and dense information, leading to poor user experiences due to unclear information hierarchy and actions. To address this, a new Sidebar frame has been introduced alongside the existing Header frame, facilitating more intuitive layouts for Retool applications. The Sidebar allows for vertical navigation, making it easier to manage multi-page apps with numerous top-level menu items, and supports in-page navigation to enhance usability through progressive disclosure. This feature also includes a collapsible option to reduce interface clutter, enabling users to focus on primary tasks by hiding secondary information. Additionally, the update enhances scripting APIs and customization opportunities, allowing dynamic control over frame visibility and navigation content. These improvements aim to simplify complex app interfaces, and are available to cloud customers, with plans to extend to on-premise users in future releases.