display event timeline on full calendar showing on the start day only

after some research, I found it is able to change it by nextDayThreshold.
https://fullcalendar.io/docs/event_rendering/nextDayThreshold/

but I am using full calendar for event manager, I wonder anyone help to give some hint where to place the code

you can try something like this inside your theme header.php then inside html head tag

<script type="text/javascript">
  jQuery(document).ready(function($){
     $('#wpfc-calendar').fullCalendar( 'gotoDate', 2013 , 3 );
  });
</script>