I can show you how to increase the font size when entering bills and writing a check, @Beach2.
You can increase the font size using the Ctrl key on your keyboard. Just simply hold down the Ctrl key and press the + (plus sign) to increase the font size.
Also, pressing the Ctrl key and - (minus sign) will decrease the font size.
If you'd like to reset the font size to the default size, you'll just have to press Ctrl+0 (zero).
Here's a guide on how to enter and pay bills and on how to write checks in QuickBooks Online.
Let me know if there's anything that I can help with your account. I'm always here to assist.