Items cannot be hidden or "retired" individually, but you can hide groups and associate your user-created items with these groups.
- To do this go to the "Home" tab in the ribbon and choose "My Preferences". For versions prior to version 11, go to the "View" menu and choose "Preferences".
- Click "Groups to Exclude"
- Any groups checked in this window will be excluded from any searches. The items will still be "active", so if they are used as an ingredient in a recipe or person that is not excluded they will still behave normally.