Hi rob312,
In InfoPath, Zooming option is not there. If you want, make a copy of the form view and increase the form size, controls size and font size etc.. in the copied view.
In the main form view put a zooming button by applying a rule like this.
Double click the zooming button and click on the Rules button -> Add button-> Add Action.
In the Action combo list select 'Switch View' and give the copied view.
If he want to come back to submit the form put a Zoom out button in the copied view and in the switch view select the main form.
If the user wants to zoom then he/she will click on the button. you provide a help for that to see the Zooming button.
Hope this will help you.
B.Shiva Prasad
InfoPath Dev,
http://www.ggktech.com
India