How to set a fixed width to the bar in rangebarseries ?

Hello,

There is no setting for specifying a fixed width for the bars. It directly depends on the values displayed on the axis, its minimum/maximum range and defined step accordingly. The more axis values you have, the smaller width for the range bar you will have:

            LinearAxis verticalAxis = radChartView1.Axes.Get<LinearAxis>(1);
            verticalAxis.Minimum = 840; //Minutes 0:00
            verticalAxis.Maximum = 890; //Minutes 23:00
            verticalAxis.MajorStep = 10; //60 minutes in an hour

If less dates are added as categories, the range bars will be wider:

Another approach to enlarge the bars is to use the zoom functionality:

https://docs.telerik.com/devtools/winforms/controls/chartview/features/scroll-and-zoom 

Off topic, I would highly encourage you to activate a trial license which will give you the opportunity to evaluate our controls for 30 days and see whether it is appropriate for your developing purposes and upgrade to a purchase license later:

https://www.telerik.com/purchase/support-plans 

https://www.telerik.com/products/winforms.aspx 

I hope this information helps. 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik