If you need to use larger or smaller fonts at all times, close Notes client, open notes.ini file in a text editor and add the following setting as a new line anywhere in the file:
Display_font_adjustment=n
“n” is the number of points added to the default size and is a number between -1 and 25. For example, if you want to increase the font size by 3 points, you would type: Display_font_adjustment=3