This site is being deprecated.
Please see the official X‑Plane Support page for help.
There's nothing built into X-Plane 10 currently, but I did find a few other suggestions here, such as a Mac zoom option and changing the screen resolution.
It's definitely something we're aware of and will work to change in the future. While you don't need to file a suggestion for this issue, if you come across others you can submit feature requests through the bug reporter here. Just tag it feature request in the subject and we'll track it in our never ending wish list. ;)
This site is no longer being actively maintained.