The font size that prints on the invoices is too small

Hello there, 

I'm here to help you make your invoices easier to read by adjusting the font size.

It's important to have clear and appropriately sized fonts on your business documents. This will improve the overall look of your invoices and make them more understandable for your customers.

Here's how to change the font size:

1. Click the Gear icon.
2. Go to Custom Form Styles. 
3. Select a template or create a new one.
4. Press Select a different font.
5. Adjust the font size.
6. Click Done.

For more info on customizing your sales forms, refer to this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.

For future use, here's a guide on generating reports concerning your invoices: Run reports.

If you have any other concerns with your invoices, please feel free to come back to this post. I'll be right here ready to assist you.