You use the Zoom tool to change the zoom magnification of a model.
Note: When you start the Zoom tool from the Full Navigation wheel, incremental zooming must be enabled in the Options Editor in order to use CTRL+click and SHIFT+click.
Zoom Constraints
When changing the magnification of a model with the Zoom tool, you cannot zoom in any further than the focus point or out past the extents of the model. The direction you can zoom in and out is controlled by the center point set by the Center tool.
Note: Unlike the Zoom tool on the big View Object wheel, the Zoom tool on the mini View Object wheel and the Full Navigation wheels are not constrained.