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

• Walk Through
• Pan or Truck

The Walk Through button is one way to turn on walkthrough navigation.

The use of the Pan or Truck button depends on which kind of viewport you are in:

• Perspective viewports (Pan)
• Camera viewports (Truck Camera)

This flyout doesn't appear for orthographic viewports or spotlight viewports. These viewports don't provide walkthrough navigation.