I have a calendar with dayGridMonth view.

When I create 1 event, the row with the week increases in height a tiny bit. That's not that bad, but when I create another event, the row increases very much and makes the calendar look ugly.

You can see the exact problem in a Codepen from their offical website.

As you can see, the row height has increased: Screenshot from codepen

BUT: In the Demo on their Website, this does not happen. This is the behaviour I want. How do I achieve this? I was unable to find a tutorial for anything like this.