Be careful, though, @cometomama. If you add more custom fields to the Customers table and set them to appear as columns, it is pretty likely that the added (unadjustable) width from the columns will push the money columns off the right side of the screen and you’ll have to scroll over every time to see customers’ account balances.
This is not something that can be fixed, apparently.
See this thread: Hiding default columns from Customers screen