Pan/Truck, 2D Pan Zoom, and Walkthrough Flyout

In Perspective and Camera viewports, this flyout lets you choose between Walkthrough navigation, 2D Pan Zoom, or Pan/Truck.

This flyout doesn't appear for orthographic viewports or spotlight viewports. Spotlight viewports don't provide walkthrough navigation, and show the Truck and 2D Pan Zoom flyout. Orthographic viewports show only the Pan button.