Can I make the gray test black so that I can read it more easily?

I'd like to welcome you here and answer your question about font preferences, droston.

For now, there's no option to change the font or text color in QuickBooks Online. You'll want to take a look at this article to see all the settings you can change in your account: Edit Company Settings in QuickBooks Online.

Although, you can customize the font color of your sales transactions when printing and sending them out to your customers. Here's an article as a guide: Customize Invoices, Estimates, and Sales Receipts in QuickBooks Online.

Just in case you want to personalize or add more details to your sales transactions, feel free to check out these articles: 

• Add, Customize, or Remove Logos on Sales Forms
• Add Custom Transaction Numbers to Sales Forms in QuickBooks Online

The Community is always available if you have any further questions for us. We'd be glad to join you again and offer our help anytime you need it.