1. Go to your Devices and Printers settings.
  2. Right-click on your installed Dot Matrix printer, and select "Printer Properties"
  3. You will now be making changes to the settings under 3 tabs, namely: 
    1. "General", 
    2. "Advanced", and 
    3. "Device Settings".
  4. Under the General tab, click on "Preferences"
  5. Click on Advanced
  6. Under "Paper Size" it should be set to the custom print form that was created for your invoice paper. (In this case, the print size will be referred to as "Invoice".)
  7. Under the Advanced tab, click Printing Defaults, and do the same as step 6, making sure it says "Invoice" instead of A4/Letter/A5 or any other paper size.
  8. Then finally, under Device Settings, make sure to select the Invoice paper size there as well.


NOTE: Due to the nature of invoice paper and its different paper sizes, paper adjustments might need to be made to the paper itself to align the printing into the correct boxes on the document. On the printer itself, adjust the paper accordingly up, down, left or right to ensure that when you print a document, that everything aligns and prints correctly.


NOTE: Learn How to create a custom print form size.