FullCalendar event title only allowed One Line

Look in your css file for the following entry:

.fc-event-time, .fc-event-title {
padding: 0 1px;}

and modify it like this

.fc-event-time, .fc-event-title {
padding: 0 1px;
white-space: nowrap;
}

.fc-title {
white-space: normal;

}

Instead of editing the source CSS, you can do this on the HTML page:

<style>
.fc-day-grid-event > .fc-content {
    white-space: normal;
}
</style>

Source: Multiline titles in fullcalendar ...

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