I've got you covered, persepheniework.
You can press CTRL and + on your keyboard to increase the font size of texts in QuickBooks Online.
There's also a setting where you can zoom in and out the display depending on your browser. The following link will help you update this:
I'm also adding this handy topic: Help articles for QuickBooks Online to get started with the accounting software. It includes sub-topics for more details.
Feel free to click the Reply button if there's anything else you need. I'm glad to help you out.