Hi there, @barney010284.
Currently, the maximum font size limit is 12 pt.
I know this would be beneficial if we could increase it further. In the meantime, I'd suggest visiting our blog site to stay in the latest updates like features and product releases.
Also, you can always visit the Community and search for topics such as video tutorials and articles and more: QuickBooks Support.
Feel free to place a comment here if you need further assistance. I'm always here to help. Enjoy your day!