It's awesome you're using QuickBooks Online. I know how useful it is to have the flexibility of the display on your transactions. I'll be happy to help you with this.
The information that pulls up on your screen when you print from QuickBooks Online links to entries present in your books. If you don't want the price to show on your printed document, you can leave the Amount field empty when creating a purchase order or estimate before printing.
In case you need to review how to create a purchase order or estimate in QBO, check out these articles: