Default value: ON.
This setting is relevant for the page for creating and editing a booking.
This setting is only relevant on the booking page.
ON:
The field 'Number of participants' is displayed when creating a booking. It is checked that number of participant does not exceed 'max. number of participants' on the resource(s).
OFF:
The field 'Number of participants' is not displayed on the page, and no validation is done.