This site is being deprecated.
Please see the official X‑Plane Support page for help.
Unfortunately there's nothing in X-Plane at this time to adjust the text size. We have people ask about this a lot here on the forum, and this question/answer looks like it has a lot of info in. I don't have a high resolution monitor, so I have not tried any of the suggestions though, and cannot vouch for their usability.
This site is no longer being actively maintained.