How to hide the "Search"?

[Photelegy]

How can I hide the "Search" for specific users without hiding the whole header?

kiosk_mode:
  user_settings:
    - users:
        - Guest
      hide_sidebar: true
      hide_header: false
      hide_overflow: true
      hide_menubutton: true

Is there something like hide_search: true to only hide the search?