Thank you for the suggestion, we have implemented drag and drop reordering for Knowledgebase Articles which allow you to sort the order in which they display on your Help Center. Additionally, you can "pin" articles on your Help Center by using the "Featured Articles" option. This is set in the Help Center Design menu. You will need the IDs of the articles you want to highlight, then go to Admin > Help Center > Help Center Design, then on the menu there will be a box where you can input the IDs for the articles you want featured on your Help Center. Adding articles to this will place them at the top of the Knowledgebase block on your Help Center.