FullCalendar: resize event not working in month view

I'm working on a Angular 10 project. I am using fullcalendar.io

When I want to resize a event, but does it do nothing. I have tried this: https://fullcalendar.io/docs/eventResize. It works in the demo app: https://fullcalendar.io/#demos

calendarOptions: CalendarOptions = {
headerToolbar: {
left: 'prev,next today',
center: 'title',
right: 'dayGridMonth'
},
initialView: 'dayGridMonth',
dateClick: this.handleDateClick.bind(this), // bind is important!
weekends: false,
events: this.convertBookingProjectsToEvents(),
editable: true,
selectable: true,
};

eventResize(info) {
alert(info.event.title + ' end is now ' + info.event.end.toISOString());

if (!confirm('is this okay?')) {
info.revert();
}
}



How can I make this work?

Kind regards

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