If you would like to run a report in Xero to view all your prepayments, follow the steps below:
1) While in Xero go to Accounting > Reports > Sales > More reports and click Receivable Invoice Detail or Receivable Invoice Summary.
2) Select the date range you would like to run the report for
3) Click Report Settings
4) Tick 'Include' Prepayments
5) In Layout, choose Group by : Source
6) Click Update
Now at the bottom of your report you will see Prepayments for the date range selected.