To view how much a Customer has spend on Sales, locate the Customer from the Customer List

Tap on the Customers' name

Select Stats from the Info / Reservations / Sales / Stats toggle

The Total Sales is the amount of Sales that exist for this Customer

The Total Revenue (Sales) is the sum total of the value of all of this Customer Sales

The Total Tips (Sales) is the sum total of all Tips included in the Sales for this Customer

Please note: Sales and Reservations are different and do not need to match up