The DateRangePicker is available for UI customization that can be achieved by using the available properties and events in the component.
Start day in a week will differ based on the culture, but you can also customize this based on the application needs. For this, use the FirstDayOfWeek property. By default, first day of a week in en-US is Sunday. In the following example, it is customized to Wednesday with the help of this property.
@using Syncfusion.Blazor.Calendars <SfDateRangePicker Placeholder="Select a range" FirstDayOfWeek=3></SfDateRangePicker>
The output will be as follows.