The 3D Navigation commands are available only in the 3D Window.
Use Window > Toolbars > 3D Visualization
or Window > Toolbars > Simple 3D to display these toolbars as needed.
If the 3D window is active, the Quick Options Bar contains shortcuts to the Orbit and Explore commands.
Note: The 3D Navigation controls from earlier versions of ARCHICAD can be accessed by choosing Window > Toolbars > Classic 3D Navigation toolbar.
See 3D Navigation Extras.