how do I change margin defaults.

[rambaux]

Default margins are too wide how do I reset them?

[Chimney_83]

Greetings @rambaux , 

Welcome to HP Forums and Thanks for the post. 

I understand that you are looking to change the margins while printing.

Not to worry, I will be glad to help.

May I know which application are you using to print?

Have you referred to the paper-handling specifications of your printer?

Please click here for the specifications of your printer.

Please go through the paper-handling specifications to understand the papers supported and the margins supported by your printer. 

To understand that print settings, please refer to the below articles for assistance. 

HP Printers - Printing Photos (Mac)

HP Printers - Printing Documents (Mac)

HP Printers - Print Driver Settings Guide (Mac)

HP Inkjet Printers - Printing with Black Ink Only (Mac)

Let me know if this helped, please do reply with more information and screenshots if possible for further assistance.