Categories
A category is a list of websites that are grouped based on their dominant content, e.g. education, alcohol, finance, etc. The Categories tab lists all the categories of websites that are currently defined in the central web categories database.
Use the Categories tab to specify what categories you want to allow or block access to for a particular policy. By default, all categories are allowed.
Go to Locations & Policies > Edit Policy and click the Categories tab to view all categories:
Allow or block categories by clicking on the slider buttons. Toggle between green
to allow access to that category or red 
to block access.Categories are grouped into ten category groups. Click Allow/Block All to allow or block access to all categories within a particular group.
When you have finished editing, click Done to save changes and close the Edit Policy panel.