The red bubble over the bell clicked on unread to show oldest to newest or all unread instead of just 15

As the final approver for our entire district, I would like to see the oldest unread notifications when clicking on the red bubble so that I can get the oldest pending requests approved first. Or show all of them (more than 15) so I can scroll to the oldest requests. When I have more than 15, I can only click on the newest requests that need to be processed when there are older requests waiting. Thank you.