Column header Auto-Fit feature will automatically adjust the column header height to fit all the text. It is enabled by default. You can disable it using HeaderHeightAutoFit property.
JavaScript
<div id="dp"></div> <script type="text/javascript"> var dp = new DayPilot.Calendar("dp"); dp.headerHeightAutoFit = false; // ... dp.init(); </script>
ASP.NET WebForms
<DayPilot:DayPilotCalendar runat="server" ID="DayPilotCalendar1" HeaderHeightAutoFit="false" ... />
Demo
ASP.NET MVC
MVC View
@Html.DayPilotCalendar("dpc", new DayPilotCalendarConfig { // ... HeaderHeightAutoFit = false, // ... })