You can assign a due date to a topic. When a topic's due date is today or in the past, it's highlighted in red.
Topic due dates are completely optional. You can choose to assign due dates to some topics and not others, or you can fully disable due dates in your organization if it's not helpful to you.
To change a topic's size, visit the topic's page and select a due date from the dropdown at the top of the page.
The Admin Settings section is only visible to team members with the Admin role.