Please follow the steps mentioned below to see view/download pending amount of a customer/all customers:
Step 1:- Go to reports
Step 2:- Click on Transaction report >> Select desired report >> Scroll to the right and look for status column with filter
Step 3:- Click on the filter option in the Status. Now select Pending and click on apply.
After selecting, pending invoices will be reflected in the report.
Step 4:- You can select pending invoices for particular customer with desired date range >> As well as download it in Excel/PDF