For TurboTax Desktop, from the Welcome page or in the return, like the product support did with you, you can click on View // Zoom // Zoom In, or from Form mode, you click on the text box in the blue bar (see screenshot). Sometimes, it can take effect only if you close the software and reopen it, depending on the option you used.

If that doesn't work, you can also try changing the scale and/or screen resolution in the Windows settings. 

Thank you for choosing TurboTax.