View > Zoom Factor

Sets the zoom magnification factor.

Each time you zoom in the model will be magnified by this factor. Each time you zoom out the model will be shrunk by this factor.

This can also be set simply by typing in the zoom factor then selecting any zoom button or key.

Notes:

You should set the desired centre of rotation

View > Centre of Rotation

before zooming in

Zoom In

If the translation toolbar is not visible it can be activated with

Tools > Translation Toolbar.