Do your volunteers (surely not staff 😜) accidentally close rooms in check-in manager? 

Yeah our staff does that too.

Here's a simple code to add to the block in check-in manager to hide those open/close panels.

    .list-group-item .toggle-container, .toggle-container {
  1. Go to Admin > CMS Configuration > Pages.
  2. Open "Check-in Type"
  3. Click Check-in Manager (this page on the demo site)
  4. Click the gear cog on the "Check-in Manager (Locations)" block
  5. Click "Advanced Settings" tab
  6. Paste the above code in the "Pre-HTML" field and hit save

Now your open/close options are hidden.