There are people that want to use Pauker to learn Asian and Arabic languages. In order to read the complex characters used in these languages, the size of the font on the card has to be quite large. Pauker can not determine when the fonts are legible, so you can set the font sizes for the front and back sides of the card.
In the window you will see example text containing all letters of the alphabet. You can use this to determine if the text is legible enough for you. You can also modify the example text.