Any promotion that has a date range which is in the past will show as expired.
Expired Promotions can be edited (e.g. modify the date range to a current period to re-enable the promotion) or removed.
At the bottom-left corner of the Promotions list is a button called "Hide Expired".
When this button is pressed, it will change colour to indicate that it is active.
Any expired Promotions will be hidden from the list.
