Manage Published Procedures in the Distribution Center > Distribution Lists > Disable Viewing
  
Disable Viewing
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A user can be granted access to a procedure on multiple distribution lists, as well as through direct access. If you’re trying to remove a user’s access to a procedure, be sure to check all distribution lists where the procedure is included as well as their direct access to the procedure. To review users with viewing access, open the specific procedure in the Distribution Center and select the Manage Viewers or Manage Distribution Lists tabs.
Click Disable viewing from the Actions menu of a distribution list if you want to prohibit all users from viewing procedures assigned to the list.
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You must disable viewing before deleting a distribution list.