Autodesk 24000-000000-9860 - Revit Architecture - PC User Manual page 1614

In a 3D context, primarily when zooming using the 3D SteeringWheels, zoom dollies the camera in and
out. In a 2D context, using zoom from the toolbar, mouse wheel, or the 2D SteeringWheels, zoom moves
up and down perpendicular to the view.
To zoom in is to increase the magnification, making the building appear larger.
To zoom out is to decrease the magnification, making the building appear smaller.
Zoom commands are available on the View menu, 2d and 3D SteeringWheels, and the View toolbar, shown
below. See
1576 | Glossary
Zooming Project Views on page 193.