Day of the week column header height

Hello, Memo,

According to the provided screenshot, it seems that you change the font for the cell elements in the ElementRender event:  

        Font f = new Font("Verdana",18f, FontStyle.Italic );
        public RadForm1()
        {
            InitializeComponent();

            this.radCalendar1.Font = f;
            this.radCalendar1.ElementRender+=radCalendar1_ElementRender;
        }

        private void radCalendar1_ElementRender(object sender, RenderElementEventArgs e)
        {
            e.Element.Font = f;
        }

Thus, you don't have enough space inside the header to fit the weekdays text:

You can adjust the CalendarElement.HeaderHeight property to a value that would be enough for displaying the whole text: 

 this.radCalendar1.CalendarElement.HeaderHeight = 50;

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik