Managing Open Breakout rooms

I need to leave one Breakout Room open all day, whilst setting up others for just the morning or just the afternoon at our event.  There is an option to do this:

• Allow hosts to create, rename, and delete breakout rooms when rooms are open.
  Note: This option must be enabled by Zoom before it is available and requires 5.9.3 or higher.

This option does not appear on our account under .  I have upgraded my client.  How do I get Zoom to enable this option for us?

NB All we see are these two options:

• Allow meeting hosts to pre-assign participants to breakout rooms
• Allow hosts to broadcast message to participants.