Hubs can be organized into sections, thereby grouping your Hubs together.
To add a section, click on the + sign and Add a section.
Give your section a name and toggle whether you’d like to collapse the section by default or not. Once you are ready, click Done.
You can then add in relevant Hubs. Please read this article for more information on how to add Hubs.
Below is a screenshot of Hubs organized into two sections - Community and Product.