For context, I use QuickBooks online and the desktop overlay for QuickBooks Online. I have a Mac and I am trying to use a POS receipt printer made by Volcora. The receipt printer is an 80mm printer.

Whenever I attempt to print a receipt, it becomes a pdf in QuickBooks before I can print. Then when I print, only the left most characters of the receipt are printed. Everything on the right disappears. Even when I attempt different orientation (both with landscape and portrait).
I would like to print the small receipts for my customers but i am unable to do that. 

1. How can someone access printer settings in QuickBooks online?
2. How does one make sure that receipts automatically print before becoming pdfs?
3. How can one ensure the proper alignment and fit for receipt printers?