The navigation menu provides access to all of the modes for your currently selected View State. Here, you can toggle specific interaction modes and get helpful information through hovering tips that explain each tool.
Navigation tips are displayed when you hover over a navigation tile. They provide information about how to navigate using a 3-button mouse:
If you are not using a 3-button mouse, you can turn these navigation tips off by Display flyout → Toggle UI Elements → Tools → Navigation Tips.