1. Login to your Bridge.
2. If you want to hide just one item, browse to the item. Below the Smart Brand item's name, there is a " Hide this Smart Product from your public site" link. Click that.
If you want to an entire collection (pattern), browse to the collection. Scroll to the bottom of the page. There a a link that says:
"» Hide all items from this collection from appearing on your site"
Click that if you wish to hide all items in that collection.