List buttton not dispaly in the FullCalendar angular 8.

Question

please, anyone, help

 

this my code:

import listPlugin from '@fullcalendar/list';
this.model = [];
const todayDate = new Date();
const todayDateStr = todayDate.getFullYear() + '-'
+ ('0' + (todayDate.getMonth() + 1)).slice(-2) + '-'
+ ('0' + (todayDate.getDate())).slice(-2);
this.fullcalendarOptions = {
plugins: [dayGridPlugin, timeGridPlugin, interactionPlugin,listPlugin ],
defaultDate: todayDateStr,
header: {
left: 'prev,next',
center: 'title',
right: 'dayGridMonth,listWeek',
},
};