Ordering the categories (filters) of the Portfolio items, Shop products or Blog posts cannot be done directly through WordPress or the Theme Options, you can do it by using a plugin named Category Order and Taxonomy Terms Order.
To install the plugin:
- Go to your WordPress dashboard and hover Plugins > Add New
- On the Search area write the plugin name Category Order and Taxonomy Terms Order.
- Click the Install Now button
- When plugin is installed, click Activate and you’re done.
You can simply Drag and Drop the categories that will appear in the Portfolio Filter as you can see on the image.
You may be also interested to know how you can do Manual order of posts (portfolio/page/products)