Thank you for connecting with the Community, elana-schachner. I will be happy to show you how to change the font size on your reports. Here's how:

1. Go to the Gear Icon, located at the top of the page.
2. Under Your Company, select Custom form styles.
3. Locate the form that needs to be edited.
4. In the Action column, click the Edit option.
5. Under Design, you should see an option Select a different font, as seen below.
6. Make adjustments to the size and change the font if you want.
7. Hit Done once completed.

This will save this custom form style to the setting you created. You can preview your report and make more adjustments if necessary. For more information about customizing reports in Quickbooks Online, this link is very informative.

Please let me know if you need assistance. The Community and I are here to help you in any way we can. Take care and be safe.