Kathryn- In the upper right hand corner of the PAF 5 display, do you see this set of icons? - ? X
If so, click on the square ( ? ) and see if your font size changes to a larger size.
It may be that you are in a minimized (adjustable window size) configuration, and that the height of the window is less than maximum. This could cause a reduction in font size. To s-t-r-e-t-c-h the window, place the mouse cursor on the middle of the bottom border. A short, double pointed arrow should show up.(<-->) Pull down. Similarly you can adjust the top and the sides of the borders.