What happens when a loan is fully repaid?

When a loan (money you owe) has been fully repaid its balance will have reduced to zero. Only when this is the case will the 'X' button to the right-hand side of the loan screen become available (no longer greyed out), allowing you to 'close' the loan. 

Closed loans, can then be viewed by selecting the 'Include Closed checkbox at the top of this screen.