Hi, what do you mean with "view always the categories"?
The categories can be viewed here (they are only listed by name) www.joomfreak.com/<a href="www.joomfreak.com/demo" title="demo">demo</a>/jf_vihrea/index.php/portfolio
The home is a mix of both blog and portfolio items.
We have not a category view page in this <a href="www.joomfreak.com/joomla-templates.html" title="template">template</a>, if you need that you will need to customize the template. you can try using default template of k2 in backend so you will see how the categories are being displayed.
joomfreak is not affiliated with or endorsed by the Joomla Project or Open Source Matters.
The Joomla logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.