To hide a category/collection from the search, follow these steps:

  1. Go to the Searchanise control panel > Preferences section > Categories tab.
  2. Click the Edit categories button on the top right.
  3. Change the Status of any category/collection from Active to Hidden. 
  4. Save the changes.
  5. Start the re-indexation.  

You can track the indexation status in the Dashboard section. After the indexation is complete, Searchanise won’t show hidden categories in the search.