Hey nikkimolyneux,
Thanks for you post and welcome to the QuickBooks Online Community!
Currently it is not possible to edit the font size on the reports, if you need to view or print the report in a larger font you can export the report to Excel and edit from there.
Once exported, press Ctrl+A in the Excel document to select all and then change the font size.
If you'd like further customisation options, please leave feedback with our developers by going to the Settings wheel > Feedback within your account.
