'Exchange Rate' has been checked within 'Expense Columns' under 'Expense Setup' and the 'Exchange Rate' option has been checked within 'Settings' in a Expense sheet. However, I am unable to view the 'Exchange Rate' column within the Expense sheet.

'Exchange Rate' column is visible within an Expense sheet only if the currency within the 'Net Amount' column is set to a different currency other than the base currency. For Example; If the base currency is set to USD$, and the currency within 'Net Amount' is set to USD$, 'Exchange Rate' column will not be visible. Now, if the currency within 'Net Amount' is changed to CAD$, then 'Exchange Rate' column is automatically launched.