Click on the Customers tab. Here you will see a full list of customers included in Revenue. You can also see all the invoices issued to these customers.
See more information in this article: What to Do if the System is Not Recognizing Revenue Dates Correctly; How to Change Invoiced Revenue Start and End Dates
Multi- month invoices are automatically recognized by the system and spread over the time. See How ScaleXP Allocates the Spread of Revenue and Determines Deferred Revenue Amounts