Got the following from the following. Unfortunately I could not make a comment because I have too few points. fullcalendar.js v4 - How to set html in title?
eventRender: function(info) {
info.el.querySelector('.fc-title').innerHTML = "<i>" + info.event.title + "</i>";
}
When I tried the following, it works for month, week and day views. Unfortunately it does not work for list view. What did I do wrong?