Hi,
There is a serious bug in the scheduler when firstdayofweek is set to Monday/1
When you try to change the date of an event you will get the following error.
Error: System.IndexOutOfRangeException: Index was outside the bounds of the array.
at Syncfusion.Blazor.Schedule.SfRecurrenceEditor.OnStartDate()
at Syncfusion.Blazor.Schedule.SfRecurrenceEditor.OnParametersSetAsync()
at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
You can see this happening on your demo page at https://blazor.syncfusion.com/demos/scheduler/working-days?theme=bootstrap4
Try to change one of the events to Sunday and you will see the error