Here is how you can see the transaction history of a customer who's added to customer management:
Step 1: Click on 'Menu' on upper left corner
Step 2: Click on 'Customers Management'
Step 3: Click on the customer name of whose you want to see transaction history
Step 4: Click on 'View Profile'
Step 5: Click on 'Transaction history'
Note: Click on 'Load more' to view transaction history going further back
Related articles:
How to record the dues of the customer?
How to record the advance received from the customer?
How to reset the due of customer?
How to see the order placed by customers(after billing) in customer management?