How to default fieldsets to be collapsed in the desk view in Sanity.io

{
  title: 'My collapsed fieldset',
  name: 'collapsedFieldset',
  options: {
    collapsible: true, // Makes the whole fieldset collapsible
    collapsed: true, // Defines if the fieldset should be collapsed by default or not
    columns: 2 // Defines a grid for the fields and how many columns it should have
  }
}