Air Traffic Controller (ATC) Font Size

I have a 3 year-old grand-son who loves to sit on my lap and fly with me. Unfortunately when his little fingers hit the keyboard, I have to figure out what it is that he's triggered in the fsx program. My problem is that since the last time he "flew" with me, the fonts for the ATC are so small that I have to wear 2 pairs of glasses to read what the controller is saying! I miss the dialogue and I'm still amateurish enough to have to resort to the written word to remember my assigned runways etc.
Does anyone know how to restore the air traffic controllers dialogue box to a larger size as it was originally?
I have been screwing around with this for weeks now with no luck.
Does anyone know how to restore the air traffic controllers dialogue box to a larger size as it was originally?
