Thank you for the question.
There are currently two places where you can view Topics.
1. All Topics Page: In the “All Topics” page, the sorting is based on the “creation date”.
2. Left Navigation Section: On the left navigation section, the order is based on the time for adding the topic to the left navigation. So for left navigation, you can reorder by removing from navigation and adding them again.
In order to manage topics, you need to click on Profile-->Admin Settings--> Topics.
Also, thank you for sharing additional information in the comment. I will pass this on as feedback and we will keep you posted.
Hope this helps.