The navigation bar is crucial, especially when information has multiple hierarchical levels. Whether horizontal or vertical, it must be designed with the overall user experience in mind. If users need to navigate frequently, an intuitive and easily accessible bar is essential. For complex screens, it is vital that the navigation takes up as little space as possible, leaving more room for the main content. Allowing users to hide or show elements can significantly improve ergonomics. The navigation must remain consistent across all screens of the application to avoid any confusion. A well-thought-out navigation bar not only enhances efficiency but also user satisfaction by making information access quick and smooth.