You can change your product categories by clicking into the product and selecting up to 3 product types/categories in the drop-down menu on the right-hand side underneath the Product Availability section:
​Don't forget to hit save and your brand will be included in the categories you've chosen.
*You cannot edit the product categories on your Brand page editor as they are not editable in that section, they are specifically generated from the product categories for each product. i.e. if your products are labeled as "Beauty and Accessories" that is the product category that your products/brand are featured in.