Zoom

Use the options on the View tab > Navigate panel to resize the model.

Resize to Fit — Use this option to adjust the view to see the entire model.

It converts this:

to this:

This zooms in or out as required. So, it also zooms a microscopic image on the screen to one that just fits inside the window.

Tip: If you cannot see your model, click View tab > Navigate panel > Resize to Fit to centre the model at the middle of the screen.

Zoom: