Hello, @Cfoeger. 

Thanks for joining in on this thread. Allow me to give you some insight into customizing your estimate. 

Having an option for a bigger font with the message you send along for the estimate would be very beneficial for every user of QuickBooks Online (QBO). However, you can only change the font on the form/estimate itself. Although this isn't available in your account, I'll send feedback to our Product Developers so they can consider this in a new release. They try to collaborate the information from every request to improve the system for every user. 

You can check out our tutorials page for other features that are available in your account. In addition, review our QuickBooks Blog every once in a while to keep up with what's new in the product. 

If you have any other feedback that you'd like to add just let us know. The Community is always here to have your back. Should you need any further assistance with anything else in your QuickBooks account, don't hesitate to ask. I value you and the success of your business. Have a wonderful evening!