If you got to Accessibility from Prgrams>Accessories you will find the Windows magnifier.
This may help you as you can alter the level of magnification.
The only other way I can think of is to temporarily switch your display resolution to a lower setting, but this would be a bit drastic.
Most graphics card's resolutions capability can be viewed from Display>Properties>Settings>Adapter tab and then clicking List All Modes. You can set what you need from the list and reverting back once the session is over.
Enable the changes to be made without rebooting Windows.