Hello, Lawrenanne1. Currently, there isn't an option to mark your custom reports as favourites in QuickBooks Online. To view them, you'll need to navigate to the Custom Reports tab manually.
I can see how adding a favourite feature would make finding your reports much easier. Because of this, I recommend submitting feedback directly to our Product Development team. They evaluate these requests for future program updates.
To send your suggestion, go to the Gear icon and select Feedback. Enter a brief description of your request and then click Next to submit.
If you have further concerns, please feel free to reply. We're here to assist.