Allows to mark objects to book or release when applying changes.
This mode also takes the following options:
The keys of the events for which you want to render the event manager.
Start a session to temporarily hold objects upon selection.
Possible values are:
'continue': continue a previously started session by using the hold token in session storage, or start a new session if there's no hold token.
'start': start a new session (and generate a new hold token).
'manual': continue the session identified by
holdToken. Use this when you generated a hold token through our backend API.
'none': session is disabled. Objects don't get held on click.
See session for further information.