1. Go to Settings.
2. Select the Receipt tab. On this page, you will be able to modify the visibility, boldness, font-size, and alignments of several elements on your receipt. Font-size of text can be modified under Main Receipt Area.
Note if you set Hide to Yes in Main Receipt Area, the items will be hidden on the receipt. So the receipts won't be itemized anymore.
3. Press Save.
Tip #1: To manage the general font-size, enter in the preferred value under Size.
Tip #2: To manage the font-size of the modifier items, enter in the preferred value under /.