Once you start playing around in the Customize Reports area
you will start to see what you can do, and probably get all kinds of ideas about how to get the reports you want.
For a more in depth look at customizing reports in QuickBooks Online check out:
8 Reports to Set Up in QuickBooks Online
This report is much more useful than the standard.
Run your standard profit and loss.
Make sure date range covers more than one month.
Change the Display Columns By dropdown to Month.
Any time you call Support for QuickBooks Online, you will need your company ID.
Log into your QuickBooks Company, and press CTRL + ALT + ?